hanoi(3, A, B, C)
      8    hanoi(2, A, C, B)
           8    hanoi(1, A, B, C)
                  5        Move A-> C
          10    Move A -> B     
          12    hanoi(1, C, A, B)
                   5      Move C -> B
      10 Move A-> C
      12 hanoi(2, B, A, C)
           8   hanoi(1, B, C, A)
                 5 Move B -> A
           10 Move B->C
           12 hanoi(1, A, B, C)
                 5 Move A->C