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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 is not an issue of the kata but might be an issue of your code. The sort is not that easy... but it is a 5 kyu passed by 778 guys in JS and almost 3000 in all languages where the tests are the same. Good luck and cheers.