Exercises : Change CommonJS to ESmodule format

[Ashish Padhy]

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1. Description of the Feature Request:

• Currently the exercises are using CommonJs format. i.e module.exports
• Could be changed to ESmodule format. i.e export default

2. Acceptance Criteria:

3. Additional Information:

[Ashish Padhy]

Sorry 🙃
Jest is still in its experimental phase with regards to ESM.