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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 solved the problem, and I am able to compile it locally on sublime text but when I run it here I can't get this line of code
result += (int)Char.GetNumericValue(arr[i]);
it doesn't like the Char