Replace var keyword with let/const

[elijahndibe]

I changed the var declaration to let/const where necessary

Fixes #1086 (<=== Add issue number here)

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[elijahndibe]

Hello @TildaDares This the my contribution on issue assigned to me. I do kindly await your review and feedback. Thanks

[PeculiarE]

Nice job! @codeinvoke7

@TildaDares....I believe this can be merged as well. Thank you!

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[TildaDares]

Great work everyone!

[elijahndibe]

Great work everyone!

Thanks my mentor