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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 only thing different I'd do here is make the 48 a descriptive constant to avoid it being a magic number. I'd make the constant follow what @boyarkogc explains is the reason why 48 is there. I.e. CHAR_TO_INT_CONVERSTION_NUMBER or something better.