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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.
Agreed. Doing it in
C
is actually not that easy, too. The string handling isn't super involved but definitely worth more than 8 kyu. It is so unfortunate that it isn't possible to have different difficulty rankings for different languages. Sometimes the tooling makes all the difference between a Kata being super easy or actually quite hard.