expressions to not include semicolons

exercises/functions/functions4.rs

@@ -7,7 +7,7 @@
 // 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;

exercises/functions/functions5.rs

@@ -9,5 +9,5 @@ fn main() {
 }
 
 fn square(num: i32) -> i32 {
-    num * num;
+    num * num
 }