input: Write a python function to remove all even numbers from a given list.
  assert remove_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == [1, 3, 5, 7, 9]
  assert remove_even_numbers([10, 20, 45, 67, 84, 93]) == [45, 67, 93]
  assert remove_even_numbers([5, 7, 9, 8, 6, 4, 3]) == [5, 7, 9, 3]
output: def remove_even_numbers(lst):
      return [num for num in lst if num % 2 != 0]