You are given a single integer, n.
Your task is to implement a function that returns a specific string based on the divisibility of n by 3 and 5.
Return:
n is divisible by both 3 and 5.n is divisible by 3 but not by 5.n is divisible by 5 but not by 3.n itself if n is not divisible by either 3 or 5.3
"fizz"
3 is divisible by 3.
5
"buzz"
5 is divisible by 5.
15
"fizzbuzz"
15 is divisible by both 3 and 5.
7
"7"
7 is not divisible by 3 or 5.
3
"fizz"