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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.
Unfortunately your solution is wrong (hence the "Error: execution of an external program failed" ie your program) but the testing function was misplaced so it didn't count the failed tests and didn't print something.
Sorry for the inconvenience.
I re-edited the Nim translation. Your solution will get something like that:
Don't forget to reset the page and review your code. Cheers.