Why are there two newlines at the end of the function response and how to remove them?

Question

C++ / C#

THE CODE:

string python_shell(string code) {
  string command = "py -c " + code;
  FILE* fp = _popen(command.c_str(), "r");
  if (fp) {
    std::vector<char> buffer(4096);
    std::size_t n = fread(buffer.data(), 1, buffer.size(), fp);
    if (n && n < buffer.size()) {
      buffer.data()[n] = 0;
      return buffer.data();
    }
    _pclose(fp);
  }
}

And for any outcome, it gives out 2 empty lines at the end.

int main(){
    cout <<python_shell("print("")").c_str()<< endl;
    return NULL;
}

And the output is this:

ПУСТАЯ СТРОКА 1
ПУСТАЯ СТРОКА 2
КУРСОР

Answer 1

the first '\n' is added by python print
the second c++ endl ;
python_shell is "a bit wrong".