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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.
Description needs to say -1 is expected for case of empty array
Need real tests. Bug-fixing concept is OK for me.
Reference solution is wrong. It totally omits the last element.
Also, what's with the whole deal with the initial code with seemingly no purposes and the poorly written tests?