old_contents: /**
   * Has Vowels
   * 
   * hasVowel tests if the String calling the function has a vowels
   * 
   * @param {void}
   * @return {Boolean} returns true or false indicating if the string
   * has a vowel or not
   */
  String.prototype.hasVowels = function() {
      var inputString = this;
      return /[aeiou]/gi.test(inputString);
  };
new_contents: /**
   * Has Vowels
   * 
   * hasVowel tests if the String calling the function has a vowels
   * 
   * @param {void}
   * @return {Boolean} returns true or false indicating if the string
   * has a vowel or not
   */
  String.prototype.hasVowels = function() {
      var inputString = this;
      return /[aeiou]/gi.test(inputString);
  };
  
  String.prototype.toUpper = function() {
      return "";
  };
subject: add toUpper function to pass string return type test