You can do that to check if you want, but the tests dont read from the console. The console is just for humans, the tests only care about what you return from your function.

You are supposed to return the array, not print it to the terminal

Hi, I don't use Kotlin but it looks like an error message due to empty input array - are you sure your code implements this:

"If the input is an empty array or is null, return an empty array."

correctly?