Murilo Pereira 777434177f Added tests for the stack and made them pass. ...

* Make 'empty(stack)' more robust
* Only try to 'push(stack, card)' if card != NULL
* Added message explaining why 'pop(stack)' needs to create a new
  stack object when popping a stack's last element
* 'move_card(stack, stack)' now checks if the origin pops something
   before trying to 'push(stack)' to destination. This prevents
   dereferencing a possible NULL pointer.

2011-02-13 23:13:16 -02:00

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