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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.
String.to_char_list\1 should do the tirck. I've used it in my solution, also remember that 0 should return '' instead of "".
There is a minor bug in elixir version of kata.
On the first tests (also in the instruction), there is used String type as a result.
On the other hand, after "attempting" tests, there is a char.
I think it should be corrected :)