var upcase = function upcase(message) {
    return (message).toUpperCase();
}
console.log(upcase("hi there"));

var lowercase = function lowercase(message) {
    return (message).toLowerCase();
}
console.log(lowercase("HI THERE"));

console.log(upcase("it works!"));

@@ -256,12 +256,233 @@
  works!%22));%0A
+%0Avar userUpcase = prompt(%22Type a sentence and I'll shout it back at you!%22);%0Aalert(upcase(userUpcase));%0A%0Avar userLowercase = prompt(%22Now type a sentence and I'll whisper it back at you!%22);%0Aalert(lowercase(userLowercase));%0A

Update challenge-5.js