input: Write a python function to find the minimum element in a list.
  assert find_min([2, 3, 4, 1, 7, 8, 5]) == 1
  assert find_min([10, 20, 5, 6, 3, 4]) == 3
  assert find_min([-1, -5, -3, 0, 2]) == -5
output: def find_min(lst):
      return min(lst)