input: Write a python function to set all negative numbers in a list to zero.
  assert set_negative_to_zero([2, 5, -8, 0, 1, -6]) == [2, 5, 0, 0, 1, 0]
  assert set_negative_to_zero([-1, -2, -3, -4, -5]) == [0, 0, 0, 0, 0]
  assert set_negative_to_zero([1, 2, 3, 4, 5]) == [1, 2, 3, 4, 5]
  assert set_negative_to_zero([0, -1, 2, -3, 4]) == [0, 0, 2, 0, 4]
output: def set_negative_to_zero(lst):
      return [x if x >= 0 else 0 for x in lst]