input: Write a python function to find the maximum sum of two distinct elements in a list.
  assert findMaxSum([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])==19
  assert findMaxSum([10, 20, 45, 67, 84, 93])==177
  assert findMaxSum([5, 7, 9, 8, 6, 4, 3])==17
output: def findMaxSum(lst):
      if len(lst) < 2:
          return None
      max1 = max(lst)
      lst.remove(max1)
      max2 = max(lst)
      return max1 + max2