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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.
If string undefined or empty you must return '' (empty string).
You can print the input and calculate it yourself.
I keep failing 2 tests and I can't complete this kata because I cannot see why the test is failing. I've even made sure that the code took into consideration if it was passed an empty string or nothing at all. (javascript)