Write void printRectangle(int width, int height) that prints asterisks. Outer loop runs height times, inner prints width asterisks per row, then newline. Call printRectangle(5, 3) for 3 rows of 5 asterisks.
This function returns nothing. Its job is output, a side effect. This is a helper function pattern. If you need borders in a menu system, call this. Side effects are what void functions are for.