Fix: Implement _check

[Aqrtion]

Attempt to fix Issue #1
DRY up the codebase by moving the duplicate error checking code into the function exports._check(). Then, invoke this function inside each of the others. Passed all the tests.

[dantharejabot]

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

[dantharejabot]

LGTM 👍

Thanks for your contribution @Aqrtion!

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Your code style completely follows the style guide. Nice job!

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All the tests are passing. Nice job!

[dantharejabot]

🎉 You did it! 🎉

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