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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.
OK, I have changed the test cases. I should have explicitly stated in the description that you should reverse the original array. Oh well. Your solution should pass now.
It is due to you emptying out the original array. There is a note on the description. I will have a look soon.