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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.
Please raise code questions as a question instead of an issue.
By the way, have you checked that the input is actually a string?
I corrected the Example Test Case for Elixir.
Which programming language? Your post does not make a lot of sense.
Please tell me where/when you are seeing this error and which programming language it is for.