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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.
In one of the test cases, there's an array that contains 0.0. This solution fails for that test case as it replaces all "zeros" with 0. Perhaps it was written before the test case was added?
Each time its 5 times less code than mine :D