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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 last random test case (whatever one it happens to be) always fails for me as it shows extra characters on the end of the string. My code works perfectly on repl.it and other C platforms. Is there some kind of memory allocation error or error with how the end of strings are marked?