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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.
Can't be changed.
Changed description to:
"Words will contain of maximum 10 distinct letters, but word can be any length, even longer than 10 characters long."
"Words will contain of maximum 10 distinct letters, but word can be longer than 10 characters long."
It doesn't say here will be no empty strings...
I believe, as programmer, you always should think about the edge cases. Plus this case is easy to spot. Compare to some chalanges I did on this site I give away way to much information.
I agree, even in C++ and PHP this is far too simple for a 6th kyu kata