Adding note for further work

src/pig_latin.rs

@@ -1,4 +1,5 @@
 pub fn pig_latin(string: &str) -> String {
+    // NOTE: does this need to be a String or can we use the &str passed in?
     let s = String::from(string);
     let mut portion = String::new();
     let mut latinised = String::new();