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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.
https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#print-input
You could print out what you've got after each step you carry out to figure out which action isn't behaving as it should.
At the very least you can narrow it down from the whole function to a single operation.
Fix the indentation and remove the print and those quotes from the last line.