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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.
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How is this kata not an exact duplicate of mine? https://www.codewars.com/kata/55960bbb182094bc4800007b
Great Kata, but one thing:
If you need the output to not begin with a dash, then why test for negative numbers?