input: Write a function to find the sum of even numbers in a list.
  assert find_sum_of_even_numbers([1, 2, 3, 4, 5, 6, 7]) == 12
  assert find_sum_of_even_numbers([10, 21, 32, 43, 54, 65, 76]) == 172
  assert find_sum_of_even_numbers([2, 4, 6, 8, 10]) == 30
output: def find_sum_of_even_numbers(lst):
      return sum(x for x in lst if x % 2 == 0)