input: Write a python function to find the minimum element in a list.
  assert find_min([3, 5, 7, 2, 8]) == 2
  assert find_min([10, 20, 5, 15, 30]) == 5
  assert find_min([-1, -5, 0, -3]) == -5
output: def find_min(lst):
      return min(lst)