C++ C++ Game over screen

[fsfsa]

Hi, I'm trying to do a game over screen for a survival game I'm creating in my high school intro to programming class, but I can't seem to get the loop to end.Once it says game over it moves on to the next section. I also want to add an option to play again. Here is a part of my project as an examaple. I'm still new to coding so I'm not sure how to do this-please help.

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstdio>
#include <stdlib.h>
#include <windows.h>
#include<conio.h>
#include<dos.h>


using namespace std;


void SetWindow (int Width, int Height);
int GetFontSize(HANDLE windowHandle, COORD *size);
int SetFontSize (HANDLE windowHandle, COORD size);
 void gameOverscreen();
char charName;
char lastName;
int main()
{
if (color == "Red" || color == "red")
 {
     cout << "Good choice. These are tasty and safe" << endl;
 }

 else if (color == "purple" ||color == "Purple")
 {
     cout << "oh no, These were poisonous. YOU'RE DEAD";

          gameOverscreen();


                cout << "*****Game Over*****\n";

          }

 else if (color == "Black" || color == "black")
 {
     cout << "Good choice. These are exotic and safe" << endl;
 }
cout << " The dome is loaded with more supplies " << endl;
cout << "Would you like to use your map to find the dome?       "<< endl;

  return 0;
}


    void gameOverscreen()
    {
    cout << "*****Game Over*****\n";
    }

 

[BGB]

#include <iostream>

int main() {
    std::string color;
    std::cout << "Select from, Red, Purple, Black" << std::endl;
    std::cin >> color;
    
    if(color == "Red" | color == "red")
    {
        std::cout << "Good choice. These are tasty and safe" << std::endl;
    }
    else if(color == "Purple" | color == "purple")
    {
        std::cout << "*****Game Over*****" << std::endl;
    }
    else if(color == "Black" | color == "black")
    {
        std::cout << "Good choice. These are exotic and safe" << std::endl;
    }
    
    std::cout << "The dome is loaded with more supplies " << std::endl;
    std::cout << "Would you like to use your map to find the dome?"<< std::endl;

    return 0;
}