void display(char *core) {
    printf ("\33c\e[3J");
    char (*p_array)[size_x] = core;
    for (int y = 0; y < size_y; y++) {
        for (int x = 0; x < size_x; x++) {
            printf("%c", p_array[y][x]);
        }
        printf("%c", "\n");
    }
}