if (v == 0):
            if(maze[xy[0] + 1][xy[1]] == '0'):
                v = 3
            elif(maze[xy[0] - 1][xy[1]] == '0' and maze[xy[0]][xy[1] - 1] == '1'):
                v = 1
            elif(maze[xy[0]][xy[1] - 1] == '1'):
                v = 2

    elif (v == 1):
            if (maze[xy[0]][xy[1] - 1] == '0'):
                v = 0
            elif(maze[xy[0]][xy[1] + 1] == '0' and maze[xy[0] - 1][xy[1]] == '1'):
                v = 2
            elif(maze[xy[0] - 1][xy[1]] == '1'):
                v = 3

    elif (v == 2):
            if (maze[xy[0] - 1][xy[1]] == '0'):
                v = 1
            elif (maze[xy[0] + 1][xy[1]] == '0' and maze[xy[0]][xy[1] + 1] == '1'):
                  v = 3
            elif(maze[xy[0]][xy[1] + 1] == '1'):
                  v = 0

    elif (v == 3):
            if (maze[xy[0]][xy[1] + 1] == '0'):
                v = 2
            elif(maze[xy[0]][xy[1] - 1] == '0' and maze[xy[0] + 1][xy[1]] == '1'):
                v = 0
            elif(maze[xy[0] + 1][xy[1]] == '1'):
                v = 1