HW: Sokoban-3

1. Modify your showMap() function developed in Sokoban (1) to take an additional parameter "scale".
2. Define a variable "scale" in the main program with initial value 1. Users can press the '+' and '-' key to increase/decrease the size of the map. For example, when scale = 1, the original map is
   .

   When scale=3, each cell is displayed as a 3x3 block.
   .

3. You may test your functions with the following main program:

   
       n = 0
       scale = 1
       myMap = readMap(n)
       while True:
           showMap(myMap, scale)
           c = stdscr.getkey()
           if c == 'q':
               break
           elif c == '+':
               scale = scale + 1
           elif c == '-':
               scale = scale - 1
   
   
   

4. If you want to clear the screen when you scale down the map, you may invoke the erase() function.
5. The default window size of PuTTY is MAX_ROW=25 and MAX_COLUMN=80, but this can be changed by the user. Therefore, be sure to check the value of scale to prevent it from being too large or too small (becoming 0). You may obtain the number of rows and columns of the current window by the statement

   
   max_y, max_x = stdscr.getmaxyx()