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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.
It is, and you do so by callocing instead of mallocing (which may allocate non-zeroed memory). Without it you y overrun the end of the space allocated for the string.
Better: https://gitter.im/Codewars/codewars.com/kata-authoring-help
You could ask at https://gitter.im/Codewars/codewars.com/kata-solving-help but I think you should wait until you have more honor and kyu:-) Cheers!