input: Write a python function to multiply all numbers in a list.
  assert multiplyList([1, 2, 3, 4]) == 24
  assert multiplyList([2, 5, 7]) == 70
  assert multiplyList([10, 10, 10]) == 1000
output: def multiplyList(numbers):
      result = 1
      for number in numbers:
          result *= number
      return result