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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.
The random tests are incorrect. The random string needs to be calculated within the loop.
Translated to Go.
Comparing to zero in the if statement leads to unnecessary adding zero to the sum. Should be
if n > 0 {
sum += n
}