--description--

Given an integer number of seconds, return a string representing the same duration in the format "H:MM:SS", where "H" is the number of hours, "MM" is the number of minutes, and "SS" is the number of seconds. Return the time using the following rules:

• Seconds: Should always be two digits.
• Minutes: Should omit leading zeros when they aren't needed. Use "0" if the duration is less than one minute.
• Hours: Should be included only if they're greater than zero.

--hints--

format(500) should return "8:20".

assert.equal(format(500), "8:20");

format(4000) should return "1:06:40".

assert.equal(format(4000), "1:06:40");

format(1) should return "0:01".

assert.equal(format(1), "0:01");

format(5555) should return "1:32:35".

assert.equal(format(5555), "1:32:35");

format(99999) should return "27:46:39".

assert.equal(format(99999), "27:46:39");

--seed--

--seed-contents--

function format(seconds) {

  return seconds;
}

--solutions--

function format(seconds) {
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = seconds % 60;

  const secondsStr = s.toString().padStart(2, "0");
  const minutesStr = m.toString();

  if (h > 0) {
    const hoursStr = h.toString();
    return `${hoursStr}:${minutesStr.padStart(2, "0")}:${secondsStr}`;
  } else {
    return `${minutesStr}:${secondsStr}`;
  }
}