if2 solution

exercises/03_if/if2.rs

@@ -1,6 +1,4 @@
-// Step 1: Make me compile!
-// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
-
+// TODO: Fix the compiler error on this function.
 fn foo_if_fizz(fizzish: &str) -> &str {
     if fizzish == "fizz" {
         "foo"
@@ -13,13 +11,15 @@ fn main() {
     // You can optionally experiment here.
 }
 
-// No test changes needed!
+// TODO: Read the tests to understand the desired behavior.
+// Make all tests pass without changing them.
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn foo_for_fizz() {
+        // This means that calling `foo_if_fizz` with the argument "fizz" should return "foo".
         assert_eq!(foo_if_fizz("fizz"), "foo");
     }