Stopwatch

Build a simple stopwatch with Start, Stop, and Reset functionality. The stopwatch should display elapsed time in seconds and update every second while running.

Requirements

• Display a timer starting at 0.
• Include three buttons: Start, Stop, and Reset.
• On clicking Start, the timer should begin incrementing every second.
• Stop should pause the timer.
• Reset should stop the timer and reset it back to 0.
• Ensure the timer doesn’t increment multiple times if Start is clicked repeatedly.

Constraints & Edge Cases

• Timer should not increment if already running and Start is clicked again.
• After Reset, the timer should show 0 and stop ticking.
• Stop should not reset the time.
• Memory leaks must be avoided when using intervals.

Reference UI