Write a python program that finds the cubic volume of a rectangle. Ask the user to enter the length, width and height, in feet, of a rectangle. Your program should use the formula L x W x H to compute and display the cubic feet of the rectangle. L will represent the length, W will represent the width and H will represent the height. Your program should include an input function, a processing function and an output function in addition to your main function. Do not forget to include the unit of measurement you are using in the output function. Provide meaningful comments in your code to let other coders know what your intentions are for each function.