why do you open a new issue if there is one already ?

As pointed out by eurydice5717,

int main() {
// comment
}

Should become:

int main() {

}

NOT:

int main() {
}

Tried c++ and I'm sorry but... seeing the fixed tests it came to me that the reference solution does not comply to the cpp reference...

See https://en.cppreference.com/w/cpp/comment

Literally: All comments are removed from the program at translation phase 3 by replacing each comment with a single whitespace character.

E.G. in the tests: removing an entire line when the entire line is a line comment as // blablabla \n is incorrect ???

Woah, this is a cool concept, sadly this has been slept on for a long time by the looks of it. Would like to solve this some time.

No random tests.