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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The solution below shouldn't pass, add some tests to make it fail.
https://www.codewars.com/kata/reviews/5b4668e34d3b8468bc000bdc/groups/5d6cb441c968e8000108a2a2
Hello!
Good kata, but my proposal is that random string should not contain any numbers (should contain characters a-z).
Otherwise kata becomes very simple.
This is just Vigenere cipher, which means it's a duplicate to at least http://www.codewars.com/kata/vigenere-cipher-helper.