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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.
Not sure if this is still relevant, but itoa is not a standard function in C, it's really popular, but it isn't standardised across all platforms, so while one platform might have it, some other might not.
Read more: https://stackoverflow.com/questions/190229/where-is-the-itoa-function-in-linux