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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.
It's a poorly designed kata in my opinion, I wouldn't waste your time on it
Agreed, the tests are completely unhelpful because the solution is totally unintuitive. Looking at the tests doesn't allow one to form an understanding of the solution
Your link is broken, unfortunately
This comment is hidden because it contains spoiler information about the solution