Implement _check

[nayanashaji]

Implemented DRY principle to clean the code and make it more legible.
Moved the repeated checks in each function to exports._check().
Ran npm test and made sure all tests passed.

Also, thank you for guiding me through my first contribution.😊

[dantharejabot]

Yay, a pull request!

After you submit a pull request, one of the following will happen:

😭 You don’t get a response. 😭

Even on an active project, it’s possible that your pull request won’t get an immediate response. You should expect some delay as most open source maintainers do so in their free time and can be busy with other tasks.

If you haven’t gotten a response in over a week, it’s fair to politely respond in the same thread, asking someone for a review. If you know the handle of the right person to review your pull request, you can @-mention them to send them a notification. Avoid reaching out to that person privately; remember that public communication is vital to open source projects.

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🚧 You're asked to make changes to your pull request. 🚧

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👎 Your pull request doesn’t get accepted. 👎

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🎉 Your pull request gets accepted and merged. 🎉

Hooray! You’ve successfully made an open source contribution!

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Thank you for the submission, @nayanashaji! I'll review your code shortly, hang tight.