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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.
Your answer does not set a null terminator at the end of returned string correctly. There is no leak in tests, and null terminating a c-string properly is a resposibility of a user.
Its a bug in user solution, not a kata issue.