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* Add credit card validator * * Add return type hint * Add test cases for validator function * Add test cases * Feature: Rename file * Update strings/cc_validator.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update strings/cc_validator.py Co-authored-by: Christian Clauss <cclauss@me.com> * Update strings/cc_validator.py Co-authored-by: Christian Clauss <cclauss@me.com> * Review: Fix redundant checks * Review: Refactor * Fix: Update test cases * Refactor * Update credit_card_validator.py Co-authored-by: Christian Clauss <cclauss@me.com>