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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.
If I compile my code with gcc on another online compiler and on gcc on my mac it works, and returns true with the cases that here returns false.
I don't know if it's my mistake or not, I am still a beginner, but worth reporting.