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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.
The tests free it. It's always the case when you must return a heap allocated array / string (you cannot free it yourself: where would you? After return, the statement is not executed, before return then you would return a pointer to something not allocated anymore).