我的park_car功能出了什么问题

我又在为学校做一个任务，我正在慢慢实现它，我不知道为什么我的park_car函数不起作用，我只是想进行测试，程序崩溃了......这是我的代码。

PS：我无法更改***p2parkboxes，因为它像大多数其他变量一样在启动文件中给出。我只想看到楼层 0 的第一个元素为：HH-AB 1234。非常感谢您的帮助。PS2：我不能使用 std：：string 以及该任务不允许使用。

#include <iostream>
#include <cstring>
using namespace std;
#define EMPTY "----------"
class Parkbox{
    char *license_plate; // car's license plate
    public:
    Parkbox(char *s = EMPTY); // CTOR
    ~Parkbox(); // DTOR
    char *get_plate(){return license_plate;}
};
class ParkingGarage{
    Parkbox ***p2parkboxes;
    //int dimensions_of_parkhouse[3]; // better with rows,columns,floors
    int rows,columns,floors; // dimensions of park house
    int total_num_of_cars_currently_parked;
    int next_free_parking_position[3];
    // PRIVATE MEMBER FUNCTION
    void find_next_free_parking_position();
    public:
    ParkingGarage(int row, int col, int flr);// CTOR,[rows][columns][floors]
    ~ParkingGarage(); // DTOR
    bool park_car(char*); // park car with license plate
    bool fetch_car(char*); // fetch car with license plate
    void show(); // show content of garage floor
    // by floor
};
Parkbox::Parkbox(char *s ) { // CTOR
    license_plate = new char[strlen(s)+1];
    strcpy(license_plate, s);
    //cout << "ParkBox CTOR" << endl;
}
Parkbox::~Parkbox() { // DTOR
    delete [] license_plate;
    //cout << "ParkBox DTOR" << endl;
}
ParkingGarage::ParkingGarage(int row, int col, int flr){
    rows = row; columns = col; floors = flr;
    p2parkboxes = new Parkbox**[row];
    for (int i = 0; i < row; ++i) {
        p2parkboxes[i] = new Parkbox*[col];
        for (int j = 0; j < col; ++j)
            p2parkboxes[i][j] = new Parkbox[flr];
    }
}
ParkingGarage::~ParkingGarage(){
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < columns; ++j)
            delete [] p2parkboxes[i][j];
        delete [] p2parkboxes[i];
    }
    delete [] p2parkboxes;
}
void ParkingGarage::show(){
    int i,j,k;
    for (i = 0 ; i < floors; i++){
        cout << "Floor" << i << endl;
        for (j=0;j<rows;j++){
            for (k=0;k<columns;k++){
                cout << p2parkboxes[j][k][i].get_plate() << "  ";
            }
            cout << endl;
        }
    }
}
bool ParkingGarage::park_car(char*s){
    p2parkboxes[0][0][0] = Parkbox(s); //test
    //p2parkboxes[0][0][0] = s; //test
    return true;
}

int main(void) {
    // a parking garage with 2 rows, 3 columns and 4 floors
    ParkingGarage pg1(2, 3, 4);
    pg1.park_car("HH-AB 1234");
    /*pg1.park_car("HH-CD 5678");
      pg1.park_car("HH-EF 1010");
      pg1.park_car("HH-GH 1235");
      pg1.park_car("HH-IJ 5676");
      pg1.park_car("HH-LM 1017");
      pg1.park_car("HH-MN 1111"); */
    pg1.show();
    /*pg1.fetch_car("HH-CD 5678");
      pg1.show();
      pg1.fetch_car("HH-IJ 5676");
      pg1.show();
      pg1.park_car("HH-SK 1087");
      pg1.show();
      pg1.park_car("SE-AB 1000");
      pg1.show();
      pg1.park_car("PI-XY 9999");
      pg1.show(); */
    return 0;
}