## Problem Statement

Compute the sum of cubes for a given range a through b.

Write a method called `sum_of_cubes`

to accomplish this task

**Example**
Given range 1 to 3 the method should return 36

Compute the sum of cubes for a given range a through b.

Write a method called `sum_of_cubes`

to accomplish this task

**Example**
Given range 1 to 3 the method should return 36