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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.
I agree, we need more test cases to cover different scenarios
you should
print
your intermediate results (or create them in order to print them) to see what is going wrong.