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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.
When i try do this kata on swift your tests crash when i return nil, may i can return [] or need fix your tests. Ty
Upd. Use
guard l != w else { return nil }cuz 11 % 2 == 13 % 2 but 10 % 2 == 4 % 2) think about