answer.code: In function ‘int min_cardinality(int)’:
answer.code:79:17: error: ‘move_inside’ was not declared in this scope
   79 |                 move_inside(i);
      |                 ^~~~~~~~~~~
answer.code:88:36: error: ‘press_button’ was not declared in this scope
   88 |                         int temp = press_button();
      |                                    ^~~~~~~~~~~~
answer.code:89:42: error: ‘move_outside’ was not declared in this scope
   89 |                         if (ans == temp) move_outside(j);
      |                                          ^~~~~~~~~~~~