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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.
Fixed.
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No, your code is wrong, what's the input? Please read this before creating a kata issue: https://docs.codewars.com/training/troubleshooting/
No, there is no problem in random tests in javascript. That's your code's problem, read this: https://docs.codewars.com/training/troubleshooting/
In golang the tests are wrong:
Expected
<[]string | len:6, cap:8>: ["a", "b", "b", "c", "c", ""]
to equal
<[]string | len:2, cap:2>: ["ab", "c"]