comefrom: <qiyuangong>061_Rotate_List_1.py
code: def rotate( head, fast, slow):
      fast.next = head
      head = slow.next
      slow.next = None
      return head
masked: def sample_funcname ( var_0 , var_1 , var_2 ) :
      var_1.next = var_0
      var_0 = var_2.next
      var_2.next = None
      return var_0
  