input: Write a function to sum all odd numbers in a list.
  assert odd_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 25
  assert odd_numbers([10, 20, 45, 67, 84, 93]) == 205
  assert odd_numbers([5, 7, 9, 8, 6, 4, 3]) == 24
output: def odd_numbers(lst):
      return sum(num for num in lst if num % 2 != 0)