input: Write a python function to multiply all elements in a list using the reduce function.
  assert multiply_list([1, 2, 3, 4]) == 24
  assert multiply_list([5, 5, 5, 5]) == 625
  assert multiply_list([2, 3, 7]) == 42
output: def multiply_list(lst):
      from functools import reduce
      return reduce(lambda x, y: x * y, lst)