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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.
There are no test cases for this.
In this kata you cannot pass the test if you return NULL.
If malloc fails, it's easier to just run test cases again.