#class Node:
#  def __init__(self, value, next=None):
#    self.val = value
#    self.next = next

class Solution:
  def findCycleStart(self, head):
    #TODO Write your code here
    if head == None or head.next == None:
      return None
    slow, fast = head, head
    while fast != None and fast.next != None:
      slow = slow.next
      fast = fast.next.next
      if slow == fast:
        slow = head 
        while slow != fast:
          slow = slow.next
          fast = fast.next
        return slow
    return None

I feel like if you don't refine this code, this course is not even worth the money I am paying