Stopwatch (React Js) Less in 10 min

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Stopwatch using React js
Reference Code: https://medium.com/how-to-react/simple-way-to-create-a-stopwatch-in-react-js-bcc0e08e041e
Some info:
String.prototype.padStart()
The padStart() method of String values pads this string with another string (multiple times, if needed) until the resulting string reaches the given length. The padding is applied from the start of this string.

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