Merge pull request #1171 from memark/patch-1

Add quotes for readability of output

exercises/lifetimes/lifetimes1.rs

@@ -22,5 +22,5 @@ fn main() {
     let string2 = "xyz";
 
     let result = longest(string1.as_str(), string2);
-    println!("The longest string is {}", result);
+    println!("The longest string is '{}'", result);
 }

exercises/lifetimes/lifetimes2.rs

@@ -23,5 +23,5 @@ fn main() {
         let string2 = String::from("xyz");
         result = longest(string1.as_str(), string2.as_str());
     }
-    println!("The longest string is {}", result);
+    println!("The longest string is '{}'", result);
 }