Составить программу, которая содержит динамическую информацию о наличии автобусов в автобусном парке

#include <iostream>
#include <string>
using namespace std;
struct card {
    int nym_bus, nym_rout;
    bool condit;
    string name_driv;
    card *next;
};
//-------------------------------------------------------------------------
void my_cin(int &z) {
    while (!(cin >> z) || (cin.peek() != '\n')) {
        cin.clear();
        while (cin.get() != '\n');
        cout << "Error input, retry input!" << endl;
    }
}
//-------------------------------------------------------------------------
void add_card(card *&bus_park) {
    card *ptr = new card;
    cout << "Enter name driver: "; 
    cin >> ptr->name_driv;
    cout << "Enter nymber bus: "; 
    my_cin(ptr->nym_bus);
    ptr->nym_rout = ptr->condit = 0;
    ptr->next = nullptr;
    if (bus_park) {
        for (auto ptr2 = bus_park;; ptr2 = ptr2->next)
            if (!ptr2->next) {
                ptr2->next = ptr;
                break;
            }
    }
    else
        bus_park = ptr; 
}
//-------------------------------------------------------------------------
void send_ret(card &bus_park, int x) {
    int y;
    cout << "Enter nymber bus: "; my_cin(y);
    auto *time_ptr = &bus_park;
    for (; time_ptr; time_ptr = time_ptr->next)
        if (time_ptr->nym_bus == y)
            break;
        else if (!time_ptr->next) {
            cout << "Nymber bus " << y << " not found...\n";
            return;
        }
        if (x == 2 && time_ptr->condit || x == 3 && !time_ptr->condit) {
            if (x == 2)
                cout << "(error) The bus is on the route.\n";
            else
                cout << "(error) The bus is in park.\n";
            return;
        }
        else
            if (x == 2) {
                time_ptr->condit = 0;
                cout << "The bus return in park.\n";
            }
            else {
                time_ptr->condit = 1;
                time_ptr->nym_rout = rand() % 100;
            }       
}
//-------------------------------------------------------------------------
void show_bus_card(card *&bus_card) {
    int c;
    cout << "For show bus in route input 1, to show bus in park enter 2: ";
    my_cin(c);
    for (auto time_ptr(bus_card); time_ptr; time_ptr = time_ptr->next)
        if (c == 1 && time_ptr->condit) 
            cout << "\nBus nymber " << time_ptr->nym_bus <<
                "\nDriver " << time_ptr->name_driv <<
                "\nRoute nymber " << time_ptr->nym_rout << endl;
        else if (c == 2 && !time_ptr->condit)
            cout << "\nBus nymber " << time_ptr->nym_bus <<
            "\nDriver " << time_ptr->name_driv << endl;
}
//-------------------------------------------------------------------------
int main()
{
    card *bus_park(nullptr);
    int x(1);
    while (x) {
        cout << "//-----------------------------------------------------------------------\n";
        cout << "To add a driver card input 1, to send bus" <<
            " input 2 or to return bus input 3, to  show input 4. To exit enter 0: ";
        my_cin(x);
        cout << "//-----------------------------------------------------------------------\n";
        switch (x) {
        case 1:
            add_card(bus_park);
            break;
        case 2: case 3:
            if (bus_park) send_ret(*bus_park, x);
            else cout << "To start, add a record about buses!\n";
            break;
        case 4:
            if (bus_park) show_bus_card(bus_park);
            else cout << "To start, add a record about buses!\n";
            break;
        default:
            if (x)
                cout << "To enter nymber 1 of 2 or 3 or 4 or 0...\n";
        }
    }
    return 0;
}