Good Log In

#include <iostream>
#include <unistd.h>
bool Guest = false;  //Set to true to skip loggin.
std::string InputForText = "# ";

std::string Username;
std::string Password; //Ignore this
std::string Answer;

bool Redo() {
    return true;
}

void GameHub() {
    std::cout << "Pick a game:\n";
    sleep(1);
    std::cout << "1) Roberts royal\n";
    sleep(1);
    std::cout << "2) Story\n";
    sleep(1);
    do {
        std::cout << InputForText;
        std::cin >> Answer;
        if (Answer == "1") {
            std::cout << "Sorry, but this isnt built yet.\n";
        } else if (Answer == "2") {
            std::cout << "Sorry, but this isnt built yet.\n";
        }
    } while (Answer != "1" && Answer != "2");
    if (Redo() == true) {
        GameHub();
    }
}

int main() {
    if (Guest) {
        GameHub();
    } else {
        bool CU;
        bool CP;
        std::cout << "log_in or register\n";
        std::cout << InputForText;
        std::cin >> Answer;
        if (Answer == "register") {
            if (Username == Password) {
                std::cout << "Enter Username:\n";
                std::cout << InputForText;
                std::cin >> Username;
                do {
                    std::cout << "Enter Password:\n";
                    std::cout << InputForText;
                    std::cin >> Password;
                } while (Password == Username);
                std::cout << "Saving...\n";
                sleep(5);
                std::cout << "Done!\n";
                main();
            } else {
                std::cout << "Already registered.\n";
                main();
            }
        } else if (Answer == "log_in") {
            if (Username == Password) {
                std::cout << "You haven't even registered in yet.\n";
                main();
            } else {
                std::cout << "Enter username: ";
                std::cin >> Answer;
                if (Answer == Username) {
                    CU = true;
                } else {
                    CU = false;
                }
                sleep(1);
                std::cout << "Enter Password: ";
                std::cin >> Answer;
                if (Answer == Password) {
                    CP = true;
                } else {
                    CP = false;
                }
                std::cout << "Checking...";
                sleep(1);
                std::cout << "\n" << "Done!";
                if (CU == CP && CP == true) {
                    std::cout << "Correct log_in.\n";
                    GameHub();
                } else {
                    std::cout << "Incorrect log_in.\n";
                    sleep(1);
                    std::cout << "Try again.\n";
                    main();
                }
            }
        } else {
            main();
        }
    }
}