function reverseString() {
  //get the user's word

  let userWord = document.getElementById("tacoCat").value;
  let regexWord = userWord.replace(/[\W_]/g).toLowerCase();
  let start = regexWord.length - 1;
  let reverseWord = "";

  //for loop
  for (let i = start; i >= 0; i--) {
  reverseWord += regexWord[i];
  }
  let output = document.getElementById("tacoOutput");
  output.innerText = reverseWord;

  //pallindrome
  let trueFalsePalindrome = document.getElementById("palindrome");
  if (regexWord === reverseWord) {
  trueFalsePalindrome.innerText = "It's a palindrome";
  } else {
  trueFalsePalindrome.innerText = "It's not a palindrome";
  }

  }