stop method
Implementation
void stop(String label) {
final stopwatch = _timers[label];
if (stopwatch == null) {
debugPrint('❌ [$label] was not started.');
return;
}
stopwatch.stop();
final time = stopwatch.elapsed;
debugPrint('✅ [$label] completed in ${time.inMilliseconds} ms '
'(${time.inMicroseconds} µs)');
_timers.remove(label);
}