input: Write a function to find the index of the maximum even number in a list.
  assert find_max_even_index([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 9
  assert find_max_even_index([10, 20, 45, 67, 84, 93]) == 4
  assert find_max_even_index([5, 7, 9, 8, 6, 4, 3]) == 3
output: def find_max_even_index(lst):
      max_even = float('-inf')
      max_index = -1
      for index, num in enumerate(lst):
          if num % 2 == 0 and num > max_even:
              max_even = num
              max_index = index
      return max_index