Print the Pattern

You are asked to write a function named star_pattern that recursively prints a pattern of stars (*) up to a given depth n. The pattern starts with n stars, then it prints n-1 stars in the next line, and it continues this way until it reaches a line with 1 star. Then the pattern starts to ascend back to n stars incrementally in the same way.

Your function needs to be recursive, meaning it should call itself in order to solve the problem.