Неправильная запись const char* в std::string

#define PART_SIZE     256
#define TEMP_FILENAME "temp.request"
 
//...
 
void  WebRequests::completeRequest() {
    if (!response.empty())  //std::string response
        response.clear();
 
    Py_Initialize();
 
    std::ostringstream python_code;
    python_code <<
        "from Parser.Python.Web.WebRequests import WebRequest as wr\n" <<
        "request = wr(('" << hostname << "', " << port << "))\n" <<
        "request.set_request('''" << request.str().c_str() << "'''.encode())\n" <<
        "response = request.get_response()\n" <<
        "temp_file = open('" << TEMP_FILENAME << "', 'tw')\n" <<
        "temp_file.write(response)\n" <<
        "temp_file.close()\n";
 
    PyRun_SimpleString(python_code.str().c_str());
 
    Py_Finalize();
 
    std::ifstream temp_file(TEMP_FILENAME, std::ios::binary);
    char* response_part;                                       //data processed on parts
 
    while (!temp_file.eof()) {
        response_part = new char[PART_SIZE];
 
        temp_file.getline(response_part, PART_SIZE);
        response += response_part;
 
        delete response_part;
    }
 
    temp_file.close();
    remove(TEMP_FILENAME);
}

        "from Parser.Python.Web.WebRequests import WebRequest as wr\n" <<
        "request = wr((\'" << hostname << "\', " << port << "))\n" <<
        "request.set_request(\'\'\'" << request.str().c_str() << "\'\'\'.encode())\n" <<
        "response = request.get_response()\n" <<
        "temp_file = open(\'" << TEMP_FILENAME << "\', \'tw\')\n" <<
        "temp_file.write(response)\n" <<
        "temp_file.close()\n";

#include <iostream>
#include <string>
using namespace std;
 
int main() {
    string s = "Hello \rGoodbye, Vasya!";
    cout << s << endl;
 
    return 0;
}

temp_file.getline(response_part, PART_SIZE, '\r');