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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.
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Oh god, arithmetic series... I'm getting flashbacks from discrete math!
Great minds think alike ;-)
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Should you really be modifying the input string?
Won't the return value of strtol be implicitly converted to an int if you assign it to n?
Also, is there any point to casting NULL to char** (or using strtol instead of atol if you're not using the endptr or a base different from 10)?