Create a function that takes an object argument sizes (contains width, length, height keys) and returns the volume of the box.
volumeOfBox({ width: 2, length: 5, height: 1 }) ➞ 10
volumeOfBox({ width: 4, length: 2, height: 2 }) ➞ 16
volumeOfBox({ width: 2, length: 3, height: 5 }) ➞ 30