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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.
Great Kata! Flex your math skills and try to build without Content :D
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This was very difficult as a beginner but extremely rewarding.
If you didn't understand what you need to do:
"Take the characters from the even positions in the input (IF any), followed by the remaining characters (at the odd positions)"