text: // Solution
  
  function longest(s1, s2) {
    let combineStrings = s1 + s2;
    let letters = combineStrings.split("");
    let sortedLetters = letters.sort();
  
    let result = [];
  
    sortedLetters.forEach((letter) => {
      if (!result.includes(letter)) {
        result.push(letter);
      }
    });
  
    return result.join("");
  }
  
  //My Pseudocode
  // Gonna want to split the string up
  // add first letter to the string. have a for loop go over the rest of the string. add next letter if not already in string.
  // move on and repeat.
  // need to put in alphabetical order
  