Stop / reset JavaScript in a storyline

After about 15 hrs of chatgpt helping me write code I've got something that works!

function zeros(num) {
  if (num < 10) {
    return "0" + num;
  }
  return num;
}

var player = GetPlayer();
var count = 20; // Set the countdown duration to 20 seconds
var timerID = player.GetVar("Timer_ID"); // Retrieve the stored timer ID

function startTimer() {
  timerID = setInterval(timer, 1000);
  player.SetVar("Timer_ID", timerID); // Store the timer ID in a Storyline variable
}

function stopTimer() {
  clearInterval(timerID);
}

function resetTimer() {
  stopTimer(); // Stop the previous timer
  count = 20; // Reset the countdown duration to 20 seconds
  var minutes = zeros(Math.floor(count / 60));
  var seconds = zeros(count % 60);
  var totalTime = minutes + ':' + seconds;
  player.SetVar("Countdown_Display", totalTime);
  player.SetVar("Timer_finished", 0);
  startTimer(); // Start the new timer
}

function timer() {
  if (player.GetVar("Reset_Timer") === 1) {
    resetTimer();
    player.SetVar("Reset_Timer", 0); // Reset the player variable
    return;
  }

  count = count - 1;
  var minutes = zeros(Math.floor(count / 60));
  var seconds = zeros(count % 60);

  var totalTime = minutes + ':' + seconds;
  player.SetVar("Countdown_Display", totalTime);

  if (count <= 0) {
    player.SetVar("Timer_finished", 1);
    stopTimer(); // Stop the timer when countdown is finished
  }
}

// Clear the previous interval timer if the stored timer ID is valid
if (timerID) {
  clearInterval(timerID);
}

// Initial setup
resetTimer(); // Call the resetTimer() function initially to set up the countdown

// Example usage: Set the player variable "Reset_Timer" to 1 to reset the timer
player.SetVar("Reset_Timer", 1);