@im_8055 85b0571d81 chore: Strings: Credit Card Validation (#830) ...

* Add credit card number validator

- Validates the credit card number based on Luhn algorithm

* Test Cases: ValidateCreditCard

* Auto-update DIRECTORY.md

* Fix: Spell check

* Add references and move const inside function

* Add comments

* Fix trailing spaces

* Add short description

* Remove trailing spaces

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

2021-11-04 13:34:52 +05:30

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