formatTime method
Implementation
String formatTime({required Duration duration}) {
String twoDigits(int n) => n.toString().padLeft(2, '0');
final hours = twoDigits(duration.inHours);
final minutes = twoDigits(duration.inMinutes.remainder(60));
final seconds = twoDigits(duration.inSeconds.remainder(60));
return [if (duration.inHours > 0) hours, minutes, seconds].join(':');
}