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Author SHA1 Message Date
QuantumNovice
95a4957d9e
Luhn algorithm (#4487) 
* Luhn algorithm

Perform Luhn validation on input string
    Algorithm:
    * Double every other digit starting from 2nd last digit.
    * Subtract 9 if number is greater than 9.
    * Sum the numbers
https://en.wikipedia.org/wiki/Luhn_algorithm

* Update DIRECTORY.md

* Update luhn.py

* Update luhn.py

* Update luhn.py

* Update luhn.py

* Update DIRECTORY.md
 2021-06-13 23:49:44 +05:30