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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.
calloc doesinitialize your memory block with 0s, but malloc does not.
So the problem may relate to that.
Maybe you didn't put a null ending in the string array?
I didn't do the exercise in c yet so I am not sure.
I just solved the kata in C and cannot see any special isue with it, so I am going to resolve this issue as not a kata problem.
If you see some trash after the string returned by you, double check if your string is correctly null-terminated.