Write a solution to FizzBuzz.
Implement fizz_buzz(n) to return a list for integers from 1 through n. Use "Fizz" for multiples of 3, "Buzz" for multiples of 5, and "FizzBuzz" for multiples of both. Return the number itself as a string when neither rule applies.
Function signature: def fizz_buzz(n):
Constraints: 1 <= n <= 100.
FizzBuzzdef fizz_buzz(n):