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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.
You shouldn't expect anyone to give you a direct solution for the problem ... that's the whole purpose of codewars : to find the solution yourself.
I don't think I can give you any more hints than "cound the number of pairs"
You code counts the number of colors that have a pair. But what we want is the actual number of pairs.
Hope it helps.