У меня тоже самое, тесты проходят, но при попытке отправить, получаю сообщение о упавшем тесте.

the input is an array of pointers to const char. it is not an array of const pointers, so you can modify it. the function returns void because you are supposed to mutate the array in-place instead of returning a brand new array

We don't know, we can't see your solution.