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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.
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Yeah, I feel best practice is to use memoization, and that honestly feels beyond 5 Kyu-knowledge.
There's something wrong with the description. It says that the padding character should be Ascii(11), but - at least in Swift - the padding character was actually "÷", as can be seen from the tests.
This made my attempts fail first.