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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.
"Given an array of integers, your task is to find two same numbers and return one of them. For example, in the array ```` the answer is 2."
There is no example array given in the description?
Could do with clearer description in C. Having *length_out and digits[0] already set and then the comments next to it made it confusing when the kata itself is really simple.