I'm pretty sure, that my code is working right. Sample tests are working right, but when i send attempt tests fails with error

Test fails with error "fatal error: Index out of range", but in xcode all works perfectly well with test data. So the only reason i see here is bug in tests

Test is crushing on Swift. And it's not the only kata, that i couldn't finish cause of bugs in tests

Have same problem. Tests doesn't work, not code. But i have no idea how to fix this