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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.
This really isn't a problem.
You are making 'i' an int, and the result of sizeof(strings)/sizeof(char*) is an unsigned long
The compiler is just telling you that an int and unsigned long are not identical data types, and to be careful comparing them.