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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.
I don't know why it's right length, but only it's right (length of first element):
int len = copies[0].Length;
char[] charsResult = new char[len];
P.S. It's very stupid, but random tests sometimes run on wrong decisions (if you press the button several times).