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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.
Sorry for the late reply, I was failing to see the random tests, but I took your advice and logged the test strings, and I managed to solve the problem. Thanks alot.
The random cases are not clearly described its hard to optimize the answer.