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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.
looking at other solutions it seems tests pass even with incorrect solutions. Probably not all edgecases get tested
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test cases failing do not provide any information of what it was testing. e.g. expect null with an empty input