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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.
Still you need to null-terminate your C-strings when writing to a preallocated buffer.
Not a kata issue.
Your answers are invalid; they are not composed of consecutive elements of the input array as per the instructions.