From 52ed5dbcf912602c24c24ba5c79fcf6ee749d999 Mon Sep 17 00:00:00 2001
From: Nidhal Messaoudi <nidhalmessaoudi@hotmail.com>
Date: Sun, 26 Feb 2023 17:28:24 +0100
Subject: [PATCH 1/6] First quiz and its related modules

---
 exercises/error_handling/errors5.rs |  2 +-
 exercises/functions/functions1.rs   |  6 ++-
 exercises/functions/functions2.rs   |  4 +-
 exercises/functions/functions3.rs   |  4 +-
 exercises/functions/functions4.rs   |  4 +-
 exercises/functions/functions5.rs   |  4 +-
 exercises/if/if1.rs                 |  7 ++-
 exercises/if/if2.rs                 |  8 ++--
 exercises/intro/intro1.rs           |  2 -
 exercises/intro/intro2.rs           |  4 +-
 exercises/iterators/iterators1.rs   |  2 +-
 exercises/macros/macros4.rs         |  1 -
 exercises/quiz1.rs                  | 16 +++++--
 exercises/smart_pointers/arc1.rs    |  2 +-
 exercises/smart_pointers/cow1.rs    | 66 +++++++++--------------------
 exercises/variables/variables1.rs   |  4 +-
 exercises/variables/variables2.rs   |  4 +-
 exercises/variables/variables3.rs   |  4 +-
 exercises/variables/variables4.rs   |  4 +-
 exercises/variables/variables5.rs   |  4 +-
 exercises/variables/variables6.rs   |  4 +-
 exercises/vecs/README.md            |  2 -
 22 files changed, 60 insertions(+), 98 deletions(-)

diff --git a/exercises/error_handling/errors5.rs b/exercises/error_handling/errors5.rs
index eb5506c..6da06ef 100644
--- a/exercises/error_handling/errors5.rs
+++ b/exercises/error_handling/errors5.rs
@@ -4,7 +4,7 @@
 
 // This exercise uses some concepts that we won't get to until later in the course, like `Box` and the
 // `From` trait. It's not important to understand them in detail right now, but you can read ahead if you like.
-// For now, think of the `Box<dyn ???>` type as an "I want anything that does ???" type, which, given
+// For now, think of the `Box<dyn ...>` type as an "I want anything that does ???" type, which, given
 // Rust's usual standards for runtime safety, should strike you as somewhat lenient!
 
 // In short, this particular use case for boxes is for when you want to own a value and you care only that it is a
diff --git a/exercises/functions/functions1.rs b/exercises/functions/functions1.rs
index 03d8af7..38c3538 100644
--- a/exercises/functions/functions1.rs
+++ b/exercises/functions/functions1.rs
@@ -1,8 +1,10 @@
 // functions1.rs
 // Execute `rustlings hint functions1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     call_me();
 }
+
+fn call_me() {
+    println!("I'm Nidhal Messaoudi, a software developer going Rusty!!!");
+}
diff --git a/exercises/functions/functions2.rs b/exercises/functions/functions2.rs
index 7d40a57..5a51bdf 100644
--- a/exercises/functions/functions2.rs
+++ b/exercises/functions/functions2.rs
@@ -1,13 +1,11 @@
 // functions2.rs
 // Execute `rustlings hint functions2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     call_me(3);
 }
 
-fn call_me(num:) {
+fn call_me(num: i32) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }
diff --git a/exercises/functions/functions3.rs b/exercises/functions/functions3.rs
index 3b9e585..5b2a9a1 100644
--- a/exercises/functions/functions3.rs
+++ b/exercises/functions/functions3.rs
@@ -1,10 +1,8 @@
 // functions3.rs
 // Execute `rustlings hint functions3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    call_me();
+    call_me(12);
 }
 
 fn call_me(num: u32) {
diff --git a/exercises/functions/functions4.rs b/exercises/functions/functions4.rs
index 65d5be4..40677fc 100644
--- a/exercises/functions/functions4.rs
+++ b/exercises/functions/functions4.rs
@@ -7,14 +7,12 @@
 // in the signatures for now. If anything, this is a good way to peek ahead
 // to future exercises!)
 
-// I AM NOT DONE
-
 fn main() {
     let original_price = 51;
     println!("Your sale price is {}", sale_price(original_price));
 }
 
-fn sale_price(price: i32) -> {
+fn sale_price(price: i32) -> i32 {
     if is_even(price) {
         price - 10
     } else {
diff --git a/exercises/functions/functions5.rs b/exercises/functions/functions5.rs
index 5d76296..52b8400 100644
--- a/exercises/functions/functions5.rs
+++ b/exercises/functions/functions5.rs
@@ -1,13 +1,11 @@
 // functions5.rs
 // Execute `rustlings hint functions5` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     let answer = square(3);
     println!("The square of 3 is {}", answer);
 }
 
 fn square(num: i32) -> i32 {
-    num * num;
+    return num * num;
 }
diff --git a/exercises/if/if1.rs b/exercises/if/if1.rs
index 587e03f..660a093 100644
--- a/exercises/if/if1.rs
+++ b/exercises/if/if1.rs
@@ -1,13 +1,16 @@
 // if1.rs
 // Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 pub fn bigger(a: i32, b: i32) -> i32 {
     // Complete this function to return the bigger number!
     // Do not use:
     // - another function call
     // - additional variables
+    if a > b {
+        a
+    } else {
+        b
+    }
 }
 
 // Don't mind this for now :)
diff --git a/exercises/if/if2.rs b/exercises/if/if2.rs
index effddbb..1fca9c3 100644
--- a/exercises/if/if2.rs
+++ b/exercises/if/if2.rs
@@ -4,13 +4,13 @@
 // Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
 // Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 pub fn foo_if_fizz(fizzish: &str) -> &str {
-    if fizzish == "fizz" {
+    if fizzish == "fuzz" {
+        "bar"
+    } else if fizzish == "fizz" {
         "foo"
     } else {
-        1
+        "baz"
     }
 }
 
diff --git a/exercises/intro/intro1.rs b/exercises/intro/intro1.rs
index cfc55c3..5488977 100644
--- a/exercises/intro/intro1.rs
+++ b/exercises/intro/intro1.rs
@@ -9,8 +9,6 @@
 // when you change one of the lines below! Try adding a `println!` line, or try changing
 // what it outputs in your terminal. Try removing a semicolon and see what happens!
 
-// I AM NOT DONE
-
 fn main() {
     println!("Hello and");
     println!(r#"       welcome to...                      "#);
diff --git a/exercises/intro/intro2.rs b/exercises/intro/intro2.rs
index efc1af2..b5b1d0a 100644
--- a/exercises/intro/intro2.rs
+++ b/exercises/intro/intro2.rs
@@ -2,8 +2,6 @@
 // Make the code print a greeting to the world.
 // Execute `rustlings hint intro2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    println!("Hello {}!");
+    println!("Hello {}!", "World");
 }
diff --git a/exercises/iterators/iterators1.rs b/exercises/iterators/iterators1.rs
index f9cc3b3..0379c6b 100644
--- a/exercises/iterators/iterators1.rs
+++ b/exercises/iterators/iterators1.rs
@@ -10,7 +10,7 @@
 
 // I AM NOT DONE
 
-fn main() {
+fn main () {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
     let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
diff --git a/exercises/macros/macros4.rs b/exercises/macros/macros4.rs
index 4ee9803..c1fc5e8 100644
--- a/exercises/macros/macros4.rs
+++ b/exercises/macros/macros4.rs
@@ -3,7 +3,6 @@
 
 // I AM NOT DONE
 
-#[rustfmt::skip]
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
diff --git a/exercises/quiz1.rs b/exercises/quiz1.rs
index dbb5cdc..9988f9d 100644
--- a/exercises/quiz1.rs
+++ b/exercises/quiz1.rs
@@ -10,10 +10,20 @@
 // Write a function that calculates the price of an order of apples given
 // the quantity bought. No hints this time!
 
-// I AM NOT DONE
-
 // Put your function here!
-// fn calculate_price_of_apples {
+fn calculate_price_of_apples(quantity: i32) -> i32 {
+    let mut quantity= quantity;
+    if quantity <= 40 {
+        quantity = quantity * 2;
+    }
+    return quantity;
+
+    // if quantity > 40 {
+    //     quantity
+    // } else {
+    //     quantity * 2
+    // }
+}
 
 // Don't modify this function!
 #[test]
diff --git a/exercises/smart_pointers/arc1.rs b/exercises/smart_pointers/arc1.rs
index ffb306a..93a2703 100644
--- a/exercises/smart_pointers/arc1.rs
+++ b/exercises/smart_pointers/arc1.rs
@@ -32,7 +32,7 @@ fn main() {
     for offset in 0..8 {
         let child_numbers = // TODO
         joinhandles.push(thread::spawn(move || {
-            let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
+            let sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum();
             println!("Sum of offset {} is {}", offset, sum);
         }));
     }
diff --git a/exercises/smart_pointers/cow1.rs b/exercises/smart_pointers/cow1.rs
index 885138a..5fba251 100644
--- a/exercises/smart_pointers/cow1.rs
+++ b/exercises/smart_pointers/cow1.rs
@@ -4,9 +4,6 @@
 // Cow is a clone-on-write smart pointer.
 // It can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required.
 // The type is designed to work with general borrowed data via the Borrow trait.
-//
-// This exercise is meant to show you what to expect when passing data to Cow.
-// Fix the unit tests by checking for Cow::Owned(_) and Cow::Borrowed(_) at the TODO markers.
 
 // I AM NOT DONE
 
@@ -23,52 +20,29 @@ fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
     input
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn reference_mutation() -> Result<(), &'static str> {
-        // Clone occurs because `input` needs to be mutated.
-        let slice = [-1, 0, 1];
-        let mut input = Cow::from(&slice[..]);
-        match abs_all(&mut input) {
-            Cow::Owned(_) => Ok(()),
-            _ => Err("Expected owned value"),
-        }
+fn main() {
+    // No clone occurs because `input` doesn't need to be mutated.
+    let slice = [0, 1, 2];
+    let mut input = Cow::from(&slice[..]);
+    match abs_all(&mut input) {
+        Cow::Borrowed(_) => println!("I borrowed the slice!"),
+        _ => panic!("expected borrowed value"),
     }
 
-    #[test]
-    fn reference_no_mutation() -> Result<(), &'static str> {
-        // No clone occurs because `input` doesn't need to be mutated.
-        let slice = [0, 1, 2];
-        let mut input = Cow::from(&slice[..]);
-        match abs_all(&mut input) {
-            // TODO
-        }
+    // Clone occurs because `input` needs to be mutated.
+    let slice = [-1, 0, 1];
+    let mut input = Cow::from(&slice[..]);
+    match abs_all(&mut input) {
+        Cow::Owned(_) => println!("I modified the slice and now own it!"),
+        _ => panic!("expected owned value"),
     }
 
-    #[test]
-    fn owned_no_mutation() -> Result<(), &'static str> {
-        // We can also pass `slice` without `&` so Cow owns it directly.
-        // In this case no mutation occurs and thus also no clone,
-        // but the result is still owned because it always was.
-        let slice = vec![0, 1, 2];
-        let mut input = Cow::from(slice);
-        match abs_all(&mut input) {
-            // TODO
-        }
-    }
-
-    #[test]
-    fn owned_mutation() -> Result<(), &'static str> {
-        // Of course this is also the case if a mutation does occur.
-        // In this case the call to `to_mut()` returns a reference to
-        // the same data as before.
-        let slice = vec![-1, 0, 1];
-        let mut input = Cow::from(slice);
-        match abs_all(&mut input) {
-            // TODO
-        }
+    // No clone occurs because `input` is already owned.
+    let slice = vec![-1, 0, 1];
+    let mut input = Cow::from(slice);
+    match abs_all(&mut input) {
+        // TODO
+        Cow::Borrowed(_) => println!("I own this slice!"),
+        _ => panic!("expected borrowed value"),
     }
 }
diff --git a/exercises/variables/variables1.rs b/exercises/variables/variables1.rs
index f4d182a..84de9fd 100644
--- a/exercises/variables/variables1.rs
+++ b/exercises/variables/variables1.rs
@@ -2,9 +2,7 @@
 // Make me compile!
 // Execute `rustlings hint variables1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    x = 5;
+    let x = 5;
     println!("x has the value {}", x);
 }
diff --git a/exercises/variables/variables2.rs b/exercises/variables/variables2.rs
index 641aeb8..6715cf5 100644
--- a/exercises/variables/variables2.rs
+++ b/exercises/variables/variables2.rs
@@ -1,10 +1,8 @@
 // variables2.rs
 // Execute `rustlings hint variables2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    let x;
+    let x = 12;
     if x == 10 {
         println!("x is ten!");
     } else {
diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs
index 819b1bc..30afbf1 100644
--- a/exercises/variables/variables3.rs
+++ b/exercises/variables/variables3.rs
@@ -1,9 +1,7 @@
 // variables3.rs
 // Execute `rustlings hint variables3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    let x: i32;
+    let x: i32 = 12;
     println!("Number {}", x);
 }
diff --git a/exercises/variables/variables4.rs b/exercises/variables/variables4.rs
index 54491b0..8c2ddd6 100644
--- a/exercises/variables/variables4.rs
+++ b/exercises/variables/variables4.rs
@@ -1,10 +1,8 @@
 // variables4.rs
 // Execute `rustlings hint variables4` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    let x = 3;
+    let mut x = 3;
     println!("Number {}", x);
     x = 5; // don't change this line
     println!("Number {}", x);
diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs
index 0e670d2..1b9d9f4 100644
--- a/exercises/variables/variables5.rs
+++ b/exercises/variables/variables5.rs
@@ -1,11 +1,9 @@
 // variables5.rs
 // Execute `rustlings hint variables5` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     let number = "T-H-R-E-E"; // don't change this line
     println!("Spell a Number : {}", number);
-    number = 3; // don't rename this variable
+    let number = 3; // don't rename this variable
     println!("Number plus two is : {}", number + 2);
 }
diff --git a/exercises/variables/variables6.rs b/exercises/variables/variables6.rs
index a852012..e8314b2 100644
--- a/exercises/variables/variables6.rs
+++ b/exercises/variables/variables6.rs
@@ -1,9 +1,7 @@
 // variables6.rs
 // Execute `rustlings hint variables6` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
-const NUMBER = 3;
+const NUMBER: i32 = 3;
 fn main() {
     println!("Number {}", NUMBER);
 }
diff --git a/exercises/vecs/README.md b/exercises/vecs/README.md
index 8ff9b85..ebe90bf 100644
--- a/exercises/vecs/README.md
+++ b/exercises/vecs/README.md
@@ -13,5 +13,3 @@ the other useful data structure, hash maps, later.
 ## Further information
 
 - [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
-- [`iter_mut`](https://doc.rust-lang.org/std/primitive.slice.html#method.iter_mut)
-- [`map`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map)

From f7678b4a9ed03c81e2bedb998d5893f882acf915 Mon Sep 17 00:00:00 2001
From: Nidhal Messaoudi <nidhalmessaoudi@hotmail.com>
Date: Mon, 27 Feb 2023 12:57:40 +0100
Subject: [PATCH 2/6] Learning about primitive data types

---
 exercises/primitive_types/primitive_types1.rs |  4 +---
 exercises/primitive_types/primitive_types2.rs | 10 ++++------
 exercises/primitive_types/primitive_types3.rs |  6 +++---
 exercises/primitive_types/primitive_types4.rs |  4 +---
 exercises/primitive_types/primitive_types5.rs |  4 +---
 exercises/primitive_types/primitive_types6.rs |  4 +---
 6 files changed, 11 insertions(+), 21 deletions(-)

diff --git a/exercises/primitive_types/primitive_types1.rs b/exercises/primitive_types/primitive_types1.rs
index 0912139..91734c6 100644
--- a/exercises/primitive_types/primitive_types1.rs
+++ b/exercises/primitive_types/primitive_types1.rs
@@ -2,8 +2,6 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
-// I AM NOT DONE
-
 fn main() {
     // Booleans (`bool`)
 
@@ -12,7 +10,7 @@ fn main() {
         println!("Good morning!");
     }
 
-    let // Finish the rest of this line like the example! Or make it be false!
+    let is_evening = false; // Finish the rest of this line like the example! Or make it be false!
     if is_evening {
         println!("Good evening!");
     }
diff --git a/exercises/primitive_types/primitive_types2.rs b/exercises/primitive_types/primitive_types2.rs
index 8730baa..2f75123 100644
--- a/exercises/primitive_types/primitive_types2.rs
+++ b/exercises/primitive_types/primitive_types2.rs
@@ -2,14 +2,12 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
-// I AM NOT DONE
-
 fn main() {
     // Characters (`char`)
 
     // Note the _single_ quotes, these are different from the double quotes
     // you've been seeing around.
-    let my_first_initial = 'C';
+    let my_first_initial = 'N';
     if my_first_initial.is_alphabetic() {
         println!("Alphabetical!");
     } else if my_first_initial.is_numeric() {
@@ -18,12 +16,12 @@ fn main() {
         println!("Neither alphabetic nor numeric!");
     }
 
-    let // Finish this line like the example! What's your favorite character?
+    let my_favorite_character = '🔥'; // Finish this line like the example! What's your favorite character?
     // Try a letter, try a number, try a special character, try a character
     // from a different language than your own, try an emoji!
-    if your_character.is_alphabetic() {
+    if my_favorite_character.is_alphabetic() {
         println!("Alphabetical!");
-    } else if your_character.is_numeric() {
+    } else if my_favorite_character.is_numeric() {
         println!("Numerical!");
     } else {
         println!("Neither alphabetic nor numeric!");
diff --git a/exercises/primitive_types/primitive_types3.rs b/exercises/primitive_types/primitive_types3.rs
index fa7d019..62ae714 100644
--- a/exercises/primitive_types/primitive_types3.rs
+++ b/exercises/primitive_types/primitive_types3.rs
@@ -2,10 +2,10 @@
 // Create an array with at least 100 elements in it where the ??? is.
 // Execute `rustlings hint primitive_types3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    let a = ???
+    let a = ["Nidhal Messaoudi, A Rust professional!"; 100];
+
+    println!("{}", a.len());
 
     if a.len() >= 100 {
         println!("Wow, that's a big array!");
diff --git a/exercises/primitive_types/primitive_types4.rs b/exercises/primitive_types/primitive_types4.rs
index 71fa243..e337178 100644
--- a/exercises/primitive_types/primitive_types4.rs
+++ b/exercises/primitive_types/primitive_types4.rs
@@ -2,13 +2,11 @@
 // Get a slice out of Array a where the ??? is so that the test passes.
 // Execute `rustlings hint primitive_types4` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 #[test]
 fn slice_out_of_array() {
     let a = [1, 2, 3, 4, 5];
 
-    let nice_slice = ???
+    let nice_slice = &a[1..4];
 
     assert_eq!([2, 3, 4], nice_slice)
 }
diff --git a/exercises/primitive_types/primitive_types5.rs b/exercises/primitive_types/primitive_types5.rs
index 4fd9141..5cba3c1 100644
--- a/exercises/primitive_types/primitive_types5.rs
+++ b/exercises/primitive_types/primitive_types5.rs
@@ -2,11 +2,9 @@
 // Destructure the `cat` tuple so that the println will work.
 // Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     let cat = ("Furry McFurson", 3.5);
-    let /* your pattern here */ = cat;
+    let (name, age) = cat;
 
     println!("{} is {} years old.", name, age);
 }
diff --git a/exercises/primitive_types/primitive_types6.rs b/exercises/primitive_types/primitive_types6.rs
index ddf8b42..695d281 100644
--- a/exercises/primitive_types/primitive_types6.rs
+++ b/exercises/primitive_types/primitive_types6.rs
@@ -3,13 +3,11 @@
 // You can put the expression for the second element where ??? is so that the test passes.
 // Execute `rustlings hint primitive_types6` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 #[test]
 fn indexing_tuple() {
     let numbers = (1, 2, 3);
     // Replace below ??? with the tuple indexing syntax.
-    let second = ???;
+    let second = numbers.1;
 
     assert_eq!(2, second,
         "This is not the 2nd number in the tuple!")

From e3a20b8bc899eae9dfb440b885836812fa8614ee Mon Sep 17 00:00:00 2001
From: Nidhal Messaoudi <nidhalmessaoudi@hotmail.com>
Date: Mon, 27 Feb 2023 21:16:40 +0100
Subject: [PATCH 3/6] Learning about vectors

---
 exercises/move_semantics/move_semantics1.rs |  4 +---
 exercises/move_semantics/move_semantics2.rs | 10 ++++------
 exercises/move_semantics/move_semantics3.rs |  4 +---
 exercises/vecs/vecs1.rs                     |  4 +---
 exercises/vecs/vecs2.rs                     |  6 ++----
 5 files changed, 9 insertions(+), 19 deletions(-)

diff --git a/exercises/move_semantics/move_semantics1.rs b/exercises/move_semantics/move_semantics1.rs
index aac6dfc..c60ee74 100644
--- a/exercises/move_semantics/move_semantics1.rs
+++ b/exercises/move_semantics/move_semantics1.rs
@@ -1,12 +1,10 @@
 // move_semantics1.rs
 // Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     let vec0 = Vec::new();
 
-    let vec1 = fill_vec(vec0);
+    let mut vec1 = fill_vec(vec0);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 
diff --git a/exercises/move_semantics/move_semantics2.rs b/exercises/move_semantics/move_semantics2.rs
index 6487085..229f13b 100644
--- a/exercises/move_semantics/move_semantics2.rs
+++ b/exercises/move_semantics/move_semantics2.rs
@@ -2,12 +2,10 @@
 // Make me compile without changing line 13 or moving line 10!
 // Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
-    let vec0 = Vec::new();
+    let mut vec0 = Vec::new();
 
-    let mut vec1 = fill_vec(vec0);
+    let mut vec1 = fill_vec(&mut vec0);
 
     // Do not change the following line!
     println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);
@@ -17,12 +15,12 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(vec: &mut Vec<i32>) -> Vec<i32> {
     let mut vec = vec;
 
     vec.push(22);
     vec.push(44);
     vec.push(66);
 
-    vec
+    vec.to_vec()
 }
diff --git a/exercises/move_semantics/move_semantics3.rs b/exercises/move_semantics/move_semantics3.rs
index eaa30e3..bb83023 100644
--- a/exercises/move_semantics/move_semantics3.rs
+++ b/exercises/move_semantics/move_semantics3.rs
@@ -3,8 +3,6 @@
 // (no lines with multiple semicolons necessary!)
 // Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn main() {
     let vec0 = Vec::new();
 
@@ -17,7 +15,7 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
     vec.push(22);
     vec.push(44);
     vec.push(66);
diff --git a/exercises/vecs/vecs1.rs b/exercises/vecs/vecs1.rs
index 4e8c4cb..0e8e2f7 100644
--- a/exercises/vecs/vecs1.rs
+++ b/exercises/vecs/vecs1.rs
@@ -4,11 +4,9 @@
 // Make me compile and pass the test!
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
-    let v = // TODO: declare your vector here with the macro for vectors
+    let v = vec![10, 20, 30, 40]; // TODO: declare your vector here with the macro for vectors
 
     (a, v)
 }
diff --git a/exercises/vecs/vecs2.rs b/exercises/vecs/vecs2.rs
index 5bea09a..d016daa 100644
--- a/exercises/vecs/vecs2.rs
+++ b/exercises/vecs/vecs2.rs
@@ -6,13 +6,11 @@
 //
 // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for i in v.iter_mut() {
         // TODO: Fill this up so that each element in the Vec `v` is
         // multiplied by 2.
-        ???
+        *i *= 2;
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].
@@ -23,7 +21,7 @@ fn vec_map(v: &Vec<i32>) -> Vec<i32> {
     v.iter().map(|num| {
         // TODO: Do the same thing as above - but instead of mutating the
         // Vec, you can just return the new number!
-        ???
+        num * 2
     }).collect()
 }
 

From 1acbbb6d430d69720e0f9370d4649de92e510a31 Mon Sep 17 00:00:00 2001
From: Nidhal Messaoudi <nidhalmessaoudi@hotmail.com>
Date: Mon, 27 Feb 2023 21:17:45 +0100
Subject: [PATCH 4/6] Fixing the progress percentage

---
 src/verify.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/verify.rs b/src/verify.rs
index cf319e4..68ba6ce 100644
--- a/src/verify.rs
+++ b/src/verify.rs
@@ -13,14 +13,15 @@ pub fn verify<'a>(
     progress: (usize, usize),
     verbose: bool,
 ) -> Result<(), &'a Exercise> {
-    let (mut num_done, total) = progress;
+    let (num_done, total) = progress;
     let bar = ProgressBar::new(total as u64);
+    let mut percentage = num_done as f32 / total as f32 * 100.0;
     bar.set_style(ProgressStyle::default_bar()
         .template("Progress: [{bar:60.green/red}] {pos}/{len} {msg}")
         .progress_chars("#>-")
     );
     bar.set_position(num_done as u64);
-    bar.set_message(format!("({:.1} %)", 0.));
+    bar.set_message(format!("({:.1} %)", percentage));
 
     for exercise in exercises {
         let compile_result = match exercise.mode {
@@ -31,8 +32,7 @@ pub fn verify<'a>(
         if !compile_result.unwrap_or(false) {
             return Err(exercise);
         }
-        num_done += 1;
-        let percentage = num_done as f32 / total as f32 * 100.0;
+        percentage += 100.0 / total as f32;
         bar.inc(1);
         bar.set_message(format!("({:.1} %)", percentage));
     }

From 278a1f103b7ba694ff448fe4abe663411b7f6c92 Mon Sep 17 00:00:00 2001
From: Nidhal Messaoudi <nidhalmessaoudi@hotmail.com>
Date: Mon, 27 Feb 2023 21:33:28 +0100
Subject: [PATCH 5/6] Original exercises

---
 exercises/functions/functions1.rs             |  6 ++----
 exercises/functions/functions2.rs             |  4 +++-
 exercises/functions/functions3.rs             |  4 +++-
 exercises/functions/functions4.rs             |  4 +++-
 exercises/functions/functions5.rs             |  4 +++-
 exercises/if/if1.rs                           |  7 ++-----
 exercises/if/if2.rs                           |  8 ++++----
 exercises/intro/intro1.rs                     |  2 ++
 exercises/intro/intro2.rs                     |  4 +++-
 exercises/move_semantics/move_semantics1.rs   |  4 +++-
 exercises/move_semantics/move_semantics2.rs   | 12 +++++++-----
 exercises/move_semantics/move_semantics3.rs   |  4 +++-
 exercises/primitive_types/primitive_types1.rs |  4 +++-
 exercises/primitive_types/primitive_types2.rs | 10 ++++++----
 exercises/primitive_types/primitive_types3.rs |  6 +++---
 exercises/primitive_types/primitive_types4.rs |  4 +++-
 exercises/primitive_types/primitive_types5.rs |  4 +++-
 exercises/primitive_types/primitive_types6.rs |  4 +++-
 exercises/quiz1.rs                            | 16 +++-------------
 exercises/variables/variables1.rs             |  4 +++-
 exercises/variables/variables2.rs             |  4 +++-
 exercises/variables/variables3.rs             |  4 +++-
 exercises/variables/variables4.rs             |  4 +++-
 exercises/variables/variables5.rs             |  4 +++-
 exercises/variables/variables6.rs             |  4 +++-
 exercises/vecs/vecs1.rs                       |  4 +++-
 exercises/vecs/vecs2.rs                       |  6 ++++--
 27 files changed, 87 insertions(+), 58 deletions(-)

diff --git a/exercises/functions/functions1.rs b/exercises/functions/functions1.rs
index 38c3538..03d8af7 100644
--- a/exercises/functions/functions1.rs
+++ b/exercises/functions/functions1.rs
@@ -1,10 +1,8 @@
 // functions1.rs
 // Execute `rustlings hint functions1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     call_me();
 }
-
-fn call_me() {
-    println!("I'm Nidhal Messaoudi, a software developer going Rusty!!!");
-}
diff --git a/exercises/functions/functions2.rs b/exercises/functions/functions2.rs
index 5a51bdf..7d40a57 100644
--- a/exercises/functions/functions2.rs
+++ b/exercises/functions/functions2.rs
@@ -1,11 +1,13 @@
 // functions2.rs
 // Execute `rustlings hint functions2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     call_me(3);
 }
 
-fn call_me(num: i32) {
+fn call_me(num:) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }
diff --git a/exercises/functions/functions3.rs b/exercises/functions/functions3.rs
index 5b2a9a1..3b9e585 100644
--- a/exercises/functions/functions3.rs
+++ b/exercises/functions/functions3.rs
@@ -1,8 +1,10 @@
 // functions3.rs
 // Execute `rustlings hint functions3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    call_me(12);
+    call_me();
 }
 
 fn call_me(num: u32) {
diff --git a/exercises/functions/functions4.rs b/exercises/functions/functions4.rs
index 40677fc..65d5be4 100644
--- a/exercises/functions/functions4.rs
+++ b/exercises/functions/functions4.rs
@@ -7,12 +7,14 @@
 // in the signatures for now. If anything, this is a good way to peek ahead
 // to future exercises!)
 
+// I AM NOT DONE
+
 fn main() {
     let original_price = 51;
     println!("Your sale price is {}", sale_price(original_price));
 }
 
-fn sale_price(price: i32) -> i32 {
+fn sale_price(price: i32) -> {
     if is_even(price) {
         price - 10
     } else {
diff --git a/exercises/functions/functions5.rs b/exercises/functions/functions5.rs
index 52b8400..5d76296 100644
--- a/exercises/functions/functions5.rs
+++ b/exercises/functions/functions5.rs
@@ -1,11 +1,13 @@
 // functions5.rs
 // Execute `rustlings hint functions5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let answer = square(3);
     println!("The square of 3 is {}", answer);
 }
 
 fn square(num: i32) -> i32 {
-    return num * num;
+    num * num;
 }
diff --git a/exercises/if/if1.rs b/exercises/if/if1.rs
index 660a093..587e03f 100644
--- a/exercises/if/if1.rs
+++ b/exercises/if/if1.rs
@@ -1,16 +1,13 @@
 // if1.rs
 // Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 pub fn bigger(a: i32, b: i32) -> i32 {
     // Complete this function to return the bigger number!
     // Do not use:
     // - another function call
     // - additional variables
-    if a > b {
-        a
-    } else {
-        b
-    }
 }
 
 // Don't mind this for now :)
diff --git a/exercises/if/if2.rs b/exercises/if/if2.rs
index 1fca9c3..effddbb 100644
--- a/exercises/if/if2.rs
+++ b/exercises/if/if2.rs
@@ -4,13 +4,13 @@
 // Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
 // Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 pub fn foo_if_fizz(fizzish: &str) -> &str {
-    if fizzish == "fuzz" {
-        "bar"
-    } else if fizzish == "fizz" {
+    if fizzish == "fizz" {
         "foo"
     } else {
-        "baz"
+        1
     }
 }
 
diff --git a/exercises/intro/intro1.rs b/exercises/intro/intro1.rs
index 5488977..cfc55c3 100644
--- a/exercises/intro/intro1.rs
+++ b/exercises/intro/intro1.rs
@@ -9,6 +9,8 @@
 // when you change one of the lines below! Try adding a `println!` line, or try changing
 // what it outputs in your terminal. Try removing a semicolon and see what happens!
 
+// I AM NOT DONE
+
 fn main() {
     println!("Hello and");
     println!(r#"       welcome to...                      "#);
diff --git a/exercises/intro/intro2.rs b/exercises/intro/intro2.rs
index b5b1d0a..efc1af2 100644
--- a/exercises/intro/intro2.rs
+++ b/exercises/intro/intro2.rs
@@ -2,6 +2,8 @@
 // Make the code print a greeting to the world.
 // Execute `rustlings hint intro2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    println!("Hello {}!", "World");
+    println!("Hello {}!");
 }
diff --git a/exercises/move_semantics/move_semantics1.rs b/exercises/move_semantics/move_semantics1.rs
index c60ee74..aac6dfc 100644
--- a/exercises/move_semantics/move_semantics1.rs
+++ b/exercises/move_semantics/move_semantics1.rs
@@ -1,10 +1,12 @@
 // move_semantics1.rs
 // Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
-    let mut vec1 = fill_vec(vec0);
+    let vec1 = fill_vec(vec0);
 
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 
diff --git a/exercises/move_semantics/move_semantics2.rs b/exercises/move_semantics/move_semantics2.rs
index 229f13b..6487085 100644
--- a/exercises/move_semantics/move_semantics2.rs
+++ b/exercises/move_semantics/move_semantics2.rs
@@ -2,10 +2,12 @@
 // Make me compile without changing line 13 or moving line 10!
 // Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand for a hint.
 
-fn main() {
-    let mut vec0 = Vec::new();
+// I AM NOT DONE
 
-    let mut vec1 = fill_vec(&mut vec0);
+fn main() {
+    let vec0 = Vec::new();
+
+    let mut vec1 = fill_vec(vec0);
 
     // Do not change the following line!
     println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);
@@ -15,12 +17,12 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(vec: &mut Vec<i32>) -> Vec<i32> {
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     let mut vec = vec;
 
     vec.push(22);
     vec.push(44);
     vec.push(66);
 
-    vec.to_vec()
+    vec
 }
diff --git a/exercises/move_semantics/move_semantics3.rs b/exercises/move_semantics/move_semantics3.rs
index bb83023..eaa30e3 100644
--- a/exercises/move_semantics/move_semantics3.rs
+++ b/exercises/move_semantics/move_semantics3.rs
@@ -3,6 +3,8 @@
 // (no lines with multiple semicolons necessary!)
 // Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let vec0 = Vec::new();
 
@@ -15,7 +17,7 @@ fn main() {
     println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
 }
 
-fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
     vec.push(22);
     vec.push(44);
     vec.push(66);
diff --git a/exercises/primitive_types/primitive_types1.rs b/exercises/primitive_types/primitive_types1.rs
index 91734c6..0912139 100644
--- a/exercises/primitive_types/primitive_types1.rs
+++ b/exercises/primitive_types/primitive_types1.rs
@@ -2,6 +2,8 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
+// I AM NOT DONE
+
 fn main() {
     // Booleans (`bool`)
 
@@ -10,7 +12,7 @@ fn main() {
         println!("Good morning!");
     }
 
-    let is_evening = false; // Finish the rest of this line like the example! Or make it be false!
+    let // Finish the rest of this line like the example! Or make it be false!
     if is_evening {
         println!("Good evening!");
     }
diff --git a/exercises/primitive_types/primitive_types2.rs b/exercises/primitive_types/primitive_types2.rs
index 2f75123..8730baa 100644
--- a/exercises/primitive_types/primitive_types2.rs
+++ b/exercises/primitive_types/primitive_types2.rs
@@ -2,12 +2,14 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
+// I AM NOT DONE
+
 fn main() {
     // Characters (`char`)
 
     // Note the _single_ quotes, these are different from the double quotes
     // you've been seeing around.
-    let my_first_initial = 'N';
+    let my_first_initial = 'C';
     if my_first_initial.is_alphabetic() {
         println!("Alphabetical!");
     } else if my_first_initial.is_numeric() {
@@ -16,12 +18,12 @@ fn main() {
         println!("Neither alphabetic nor numeric!");
     }
 
-    let my_favorite_character = '🔥'; // Finish this line like the example! What's your favorite character?
+    let // Finish this line like the example! What's your favorite character?
     // Try a letter, try a number, try a special character, try a character
     // from a different language than your own, try an emoji!
-    if my_favorite_character.is_alphabetic() {
+    if your_character.is_alphabetic() {
         println!("Alphabetical!");
-    } else if my_favorite_character.is_numeric() {
+    } else if your_character.is_numeric() {
         println!("Numerical!");
     } else {
         println!("Neither alphabetic nor numeric!");
diff --git a/exercises/primitive_types/primitive_types3.rs b/exercises/primitive_types/primitive_types3.rs
index 62ae714..fa7d019 100644
--- a/exercises/primitive_types/primitive_types3.rs
+++ b/exercises/primitive_types/primitive_types3.rs
@@ -2,10 +2,10 @@
 // Create an array with at least 100 elements in it where the ??? is.
 // Execute `rustlings hint primitive_types3` or use the `hint` watch subcommand for a hint.
 
-fn main() {
-    let a = ["Nidhal Messaoudi, A Rust professional!"; 100];
+// I AM NOT DONE
 
-    println!("{}", a.len());
+fn main() {
+    let a = ???
 
     if a.len() >= 100 {
         println!("Wow, that's a big array!");
diff --git a/exercises/primitive_types/primitive_types4.rs b/exercises/primitive_types/primitive_types4.rs
index e337178..71fa243 100644
--- a/exercises/primitive_types/primitive_types4.rs
+++ b/exercises/primitive_types/primitive_types4.rs
@@ -2,11 +2,13 @@
 // Get a slice out of Array a where the ??? is so that the test passes.
 // Execute `rustlings hint primitive_types4` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 #[test]
 fn slice_out_of_array() {
     let a = [1, 2, 3, 4, 5];
 
-    let nice_slice = &a[1..4];
+    let nice_slice = ???
 
     assert_eq!([2, 3, 4], nice_slice)
 }
diff --git a/exercises/primitive_types/primitive_types5.rs b/exercises/primitive_types/primitive_types5.rs
index 5cba3c1..4fd9141 100644
--- a/exercises/primitive_types/primitive_types5.rs
+++ b/exercises/primitive_types/primitive_types5.rs
@@ -2,9 +2,11 @@
 // Destructure the `cat` tuple so that the println will work.
 // Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let cat = ("Furry McFurson", 3.5);
-    let (name, age) = cat;
+    let /* your pattern here */ = cat;
 
     println!("{} is {} years old.", name, age);
 }
diff --git a/exercises/primitive_types/primitive_types6.rs b/exercises/primitive_types/primitive_types6.rs
index 695d281..ddf8b42 100644
--- a/exercises/primitive_types/primitive_types6.rs
+++ b/exercises/primitive_types/primitive_types6.rs
@@ -3,11 +3,13 @@
 // You can put the expression for the second element where ??? is so that the test passes.
 // Execute `rustlings hint primitive_types6` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 #[test]
 fn indexing_tuple() {
     let numbers = (1, 2, 3);
     // Replace below ??? with the tuple indexing syntax.
-    let second = numbers.1;
+    let second = ???;
 
     assert_eq!(2, second,
         "This is not the 2nd number in the tuple!")
diff --git a/exercises/quiz1.rs b/exercises/quiz1.rs
index 9988f9d..dbb5cdc 100644
--- a/exercises/quiz1.rs
+++ b/exercises/quiz1.rs
@@ -10,20 +10,10 @@
 // Write a function that calculates the price of an order of apples given
 // the quantity bought. No hints this time!
 
-// Put your function here!
-fn calculate_price_of_apples(quantity: i32) -> i32 {
-    let mut quantity= quantity;
-    if quantity <= 40 {
-        quantity = quantity * 2;
-    }
-    return quantity;
+// I AM NOT DONE
 
-    // if quantity > 40 {
-    //     quantity
-    // } else {
-    //     quantity * 2
-    // }
-}
+// Put your function here!
+// fn calculate_price_of_apples {
 
 // Don't modify this function!
 #[test]
diff --git a/exercises/variables/variables1.rs b/exercises/variables/variables1.rs
index 84de9fd..f4d182a 100644
--- a/exercises/variables/variables1.rs
+++ b/exercises/variables/variables1.rs
@@ -2,7 +2,9 @@
 // Make me compile!
 // Execute `rustlings hint variables1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    let x = 5;
+    x = 5;
     println!("x has the value {}", x);
 }
diff --git a/exercises/variables/variables2.rs b/exercises/variables/variables2.rs
index 6715cf5..641aeb8 100644
--- a/exercises/variables/variables2.rs
+++ b/exercises/variables/variables2.rs
@@ -1,8 +1,10 @@
 // variables2.rs
 // Execute `rustlings hint variables2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    let x = 12;
+    let x;
     if x == 10 {
         println!("x is ten!");
     } else {
diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs
index 30afbf1..819b1bc 100644
--- a/exercises/variables/variables3.rs
+++ b/exercises/variables/variables3.rs
@@ -1,7 +1,9 @@
 // variables3.rs
 // Execute `rustlings hint variables3` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    let x: i32 = 12;
+    let x: i32;
     println!("Number {}", x);
 }
diff --git a/exercises/variables/variables4.rs b/exercises/variables/variables4.rs
index 8c2ddd6..54491b0 100644
--- a/exercises/variables/variables4.rs
+++ b/exercises/variables/variables4.rs
@@ -1,8 +1,10 @@
 // variables4.rs
 // Execute `rustlings hint variables4` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
-    let mut x = 3;
+    let x = 3;
     println!("Number {}", x);
     x = 5; // don't change this line
     println!("Number {}", x);
diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs
index 1b9d9f4..0e670d2 100644
--- a/exercises/variables/variables5.rs
+++ b/exercises/variables/variables5.rs
@@ -1,9 +1,11 @@
 // variables5.rs
 // Execute `rustlings hint variables5` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn main() {
     let number = "T-H-R-E-E"; // don't change this line
     println!("Spell a Number : {}", number);
-    let number = 3; // don't rename this variable
+    number = 3; // don't rename this variable
     println!("Number plus two is : {}", number + 2);
 }
diff --git a/exercises/variables/variables6.rs b/exercises/variables/variables6.rs
index e8314b2..a852012 100644
--- a/exercises/variables/variables6.rs
+++ b/exercises/variables/variables6.rs
@@ -1,7 +1,9 @@
 // variables6.rs
 // Execute `rustlings hint variables6` or use the `hint` watch subcommand for a hint.
 
-const NUMBER: i32 = 3;
+// I AM NOT DONE
+
+const NUMBER = 3;
 fn main() {
     println!("Number {}", NUMBER);
 }
diff --git a/exercises/vecs/vecs1.rs b/exercises/vecs/vecs1.rs
index 0e8e2f7..4e8c4cb 100644
--- a/exercises/vecs/vecs1.rs
+++ b/exercises/vecs/vecs1.rs
@@ -4,9 +4,11 @@
 // Make me compile and pass the test!
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
-    let v = vec![10, 20, 30, 40]; // TODO: declare your vector here with the macro for vectors
+    let v = // TODO: declare your vector here with the macro for vectors
 
     (a, v)
 }
diff --git a/exercises/vecs/vecs2.rs b/exercises/vecs/vecs2.rs
index d016daa..5bea09a 100644
--- a/exercises/vecs/vecs2.rs
+++ b/exercises/vecs/vecs2.rs
@@ -6,11 +6,13 @@
 //
 // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
 
+// I AM NOT DONE
+
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for i in v.iter_mut() {
         // TODO: Fill this up so that each element in the Vec `v` is
         // multiplied by 2.
-        *i *= 2;
+        ???
     }
 
     // At this point, `v` should be equal to [4, 8, 12, 16, 20].
@@ -21,7 +23,7 @@ fn vec_map(v: &Vec<i32>) -> Vec<i32> {
     v.iter().map(|num| {
         // TODO: Do the same thing as above - but instead of mutating the
         // Vec, you can just return the new number!
-        num * 2
+        ???
     }).collect()
 }
 

From 34aafa82f9b8266c6ea2a80f2cee03615a2c5297 Mon Sep 17 00:00:00 2001
From: Nidhal Messaoudi <nidhalmessaoudi@hotmail.com>
Date: Mon, 27 Feb 2023 21:36:51 +0100
Subject: [PATCH 6/6] Main exercises

---
 exercises/error_handling/errors5.rs |  2 +-
 exercises/iterators/iterators1.rs   |  2 +-
 exercises/macros/macros4.rs         |  1 +
 exercises/smart_pointers/arc1.rs    |  2 +-
 exercises/smart_pointers/cow1.rs    | 66 ++++++++++++++++++++---------
 exercises/vecs/README.md            |  2 +
 6 files changed, 52 insertions(+), 23 deletions(-)

diff --git a/exercises/error_handling/errors5.rs b/exercises/error_handling/errors5.rs
index 6da06ef..eb5506c 100644
--- a/exercises/error_handling/errors5.rs
+++ b/exercises/error_handling/errors5.rs
@@ -4,7 +4,7 @@
 
 // This exercise uses some concepts that we won't get to until later in the course, like `Box` and the
 // `From` trait. It's not important to understand them in detail right now, but you can read ahead if you like.
-// For now, think of the `Box<dyn ...>` type as an "I want anything that does ???" type, which, given
+// For now, think of the `Box<dyn ???>` type as an "I want anything that does ???" type, which, given
 // Rust's usual standards for runtime safety, should strike you as somewhat lenient!
 
 // In short, this particular use case for boxes is for when you want to own a value and you care only that it is a
diff --git a/exercises/iterators/iterators1.rs b/exercises/iterators/iterators1.rs
index 0379c6b..f9cc3b3 100644
--- a/exercises/iterators/iterators1.rs
+++ b/exercises/iterators/iterators1.rs
@@ -10,7 +10,7 @@
 
 // I AM NOT DONE
 
-fn main () {
+fn main() {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
     let mut my_iterable_fav_fruits = ???;   // TODO: Step 1
diff --git a/exercises/macros/macros4.rs b/exercises/macros/macros4.rs
index c1fc5e8..4ee9803 100644
--- a/exercises/macros/macros4.rs
+++ b/exercises/macros/macros4.rs
@@ -3,6 +3,7 @@
 
 // I AM NOT DONE
 
+#[rustfmt::skip]
 macro_rules! my_macro {
     () => {
         println!("Check out my macro!");
diff --git a/exercises/smart_pointers/arc1.rs b/exercises/smart_pointers/arc1.rs
index 93a2703..ffb306a 100644
--- a/exercises/smart_pointers/arc1.rs
+++ b/exercises/smart_pointers/arc1.rs
@@ -32,7 +32,7 @@ fn main() {
     for offset in 0..8 {
         let child_numbers = // TODO
         joinhandles.push(thread::spawn(move || {
-            let sum: u32 = child_numbers.iter().filter(|n| *n % 8 == offset).sum();
+            let sum: u32 = child_numbers.iter().filter(|&&n| n % 8 == offset).sum();
             println!("Sum of offset {} is {}", offset, sum);
         }));
     }
diff --git a/exercises/smart_pointers/cow1.rs b/exercises/smart_pointers/cow1.rs
index 5fba251..885138a 100644
--- a/exercises/smart_pointers/cow1.rs
+++ b/exercises/smart_pointers/cow1.rs
@@ -4,6 +4,9 @@
 // Cow is a clone-on-write smart pointer.
 // It can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required.
 // The type is designed to work with general borrowed data via the Borrow trait.
+//
+// This exercise is meant to show you what to expect when passing data to Cow.
+// Fix the unit tests by checking for Cow::Owned(_) and Cow::Borrowed(_) at the TODO markers.
 
 // I AM NOT DONE
 
@@ -20,29 +23,52 @@ fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
     input
 }
 
-fn main() {
-    // No clone occurs because `input` doesn't need to be mutated.
-    let slice = [0, 1, 2];
-    let mut input = Cow::from(&slice[..]);
-    match abs_all(&mut input) {
-        Cow::Borrowed(_) => println!("I borrowed the slice!"),
-        _ => panic!("expected borrowed value"),
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn reference_mutation() -> Result<(), &'static str> {
+        // Clone occurs because `input` needs to be mutated.
+        let slice = [-1, 0, 1];
+        let mut input = Cow::from(&slice[..]);
+        match abs_all(&mut input) {
+            Cow::Owned(_) => Ok(()),
+            _ => Err("Expected owned value"),
+        }
     }
 
-    // Clone occurs because `input` needs to be mutated.
-    let slice = [-1, 0, 1];
-    let mut input = Cow::from(&slice[..]);
-    match abs_all(&mut input) {
-        Cow::Owned(_) => println!("I modified the slice and now own it!"),
-        _ => panic!("expected owned value"),
+    #[test]
+    fn reference_no_mutation() -> Result<(), &'static str> {
+        // No clone occurs because `input` doesn't need to be mutated.
+        let slice = [0, 1, 2];
+        let mut input = Cow::from(&slice[..]);
+        match abs_all(&mut input) {
+            // TODO
+        }
     }
 
-    // No clone occurs because `input` is already owned.
-    let slice = vec![-1, 0, 1];
-    let mut input = Cow::from(slice);
-    match abs_all(&mut input) {
-        // TODO
-        Cow::Borrowed(_) => println!("I own this slice!"),
-        _ => panic!("expected borrowed value"),
+    #[test]
+    fn owned_no_mutation() -> Result<(), &'static str> {
+        // We can also pass `slice` without `&` so Cow owns it directly.
+        // In this case no mutation occurs and thus also no clone,
+        // but the result is still owned because it always was.
+        let slice = vec![0, 1, 2];
+        let mut input = Cow::from(slice);
+        match abs_all(&mut input) {
+            // TODO
+        }
+    }
+
+    #[test]
+    fn owned_mutation() -> Result<(), &'static str> {
+        // Of course this is also the case if a mutation does occur.
+        // In this case the call to `to_mut()` returns a reference to
+        // the same data as before.
+        let slice = vec![-1, 0, 1];
+        let mut input = Cow::from(slice);
+        match abs_all(&mut input) {
+            // TODO
+        }
     }
 }
diff --git a/exercises/vecs/README.md b/exercises/vecs/README.md
index ebe90bf..8ff9b85 100644
--- a/exercises/vecs/README.md
+++ b/exercises/vecs/README.md
@@ -13,3 +13,5 @@ the other useful data structure, hash maps, later.
 ## Further information
 
 - [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
+- [`iter_mut`](https://doc.rust-lang.org/std/primitive.slice.html#method.iter_mut)
+- [`map`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map)