input: Write a function to multiply all the numbers in a list.
  assert multiply_list([1, 2, 3, 4, 5]) == 120
  assert multiply_list([10, 20, 30]) == 6000
  assert multiply_list([2, 4, 6, 8]) == 384
output: def multiply_list(numbers):
      result = 1
      for number in numbers:
          result *= number
      return result