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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.
That's a really good point. I added another.
Also, I need to mention that I'm happy that you actually noticed that. My inspiration for including abc1 and abc2 was because an alphabet is a generalizable concept that other cipher katas hadn't generalized. I call my "Simple Substitution Cipher" simple, because you could easily offer a list of symbols in place of a single symbol.
After reviewing, I actually do have that in the test suite. You can see that using "Show Kata Test Cases" once you've completed the kata. Meanwhile, I can't get past
in your solution when trying to view it here, so I've reported that (Codewars probably forgot to escape HTML with some update, but that's okay because Codewars is awesome and will respond).