Calculate the Volume of a Pyramid

Create a function that takes the length, width, height (in meters) and output unit and returns the volume of a pyramid to three decimal places in the correct unit.

Examples

pyramid_volume(4, 6, 20, "centimeters") ➞ "160000000.000 cubic centimeters"

pyramid_volume(1843, 1823, 923, "kilometers") ➞ "1.034 cubic kilometers"

pyramid_volume(18, 412, 93, "millimeters") ➞ "229896000000000.000 cubic millimeters"

Notes

• The units used are limited to: millimeters, centimeters, meters and kilometers.
• Ensure you return the answer and add the correct unit in the format cubic <unit>.