main.cpp

const std::wstring gName[] = {L"Asesh", L"Shrestha"};

bool validation(const std::wstring& first_name, const std::wstring& last_name, uint32_t phone_number = 0) {
    if(!first_name.empty() && !last_name.empty() && phone_number != 0) {
        return true;
    }
    return false;
}

int main(int argc, const char* argv[]) {
    validation(gName[0].data(), gName[1].data(), 901);
    return 0;
}