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Clean up duplicate heading (#2424)

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Martin Geisler 2024-10-16 11:28:43 +02:00 committed by GitHub
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@ -4,8 +4,6 @@ minutes: 30
# Exercise: Luhn Algorithm
# Luhn Algorithm
The [Luhn algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm) is used to
validate credit card numbers. The algorithm takes a string as input and does the
following to validate the credit card number: