input: Write a function to sum odd numbers in a list.
  assert sum_odd_numbers([1, 2, 3, 4, 5]) == 9
  assert sum_odd_numbers([10, 11, 12, 13, 14, 15]) == 39
  assert sum_odd_numbers([0, 2, 4, 6, 8, 10]) == 0
output: def sum_odd_numbers(lst):
      return sum(x for x in lst if x % 2 != 0)