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The Luhn Formula
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Algorithms
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Sample tests are broken due to missing
itblocksdone
A duplicate of this kata.
I'm afraid it's a duplicate kata. There's already a few katas about checksums, for example: https://www.codewars.com/kata/51fc12de24a9d8cb0e000001
None of this seems to be checked in the test cases (except for spaces, but even then it's always the same format). You might want to add test cases with malformed inputs, or at least different lengths/spacings.