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.
*** ** * ** ***
***** **** *** ** * ** *** **** *****


Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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