Write a recursive function power( base, exponent ) that, when invoked, returns：
$$base^{exponent} $$
For example, power( 3, 4 ) = 3 3 3 * 3. Assume that exponent is an integer greater than or equal to 1. Hint: The recursion step would use the relationship
$$\text { base }^{\text {exponent }}=\text { base } \cdot \text { base }^{\text {exponent - 1}}$$
and the terminating condition occurs when exponent is equal to 1, because
$$base^{1} = base$$