Write a function that returns a string according to the FizzBuzz rules:

  • For numbers divisible by 3, return "Fizz"
  • For numbers divisible by 5, return "Buzz"
  • For numbers divisible by both 3 and 5, return "FizzBuzz"
  • For any other number, return the number as a string

Examples:

Input: num = 3 Output: "Fizz" Explanation: 3 is divisible by 3, so return "Fizz" Input: num = 5 Output: "Buzz" Explanation: 5 is divisible by 5, so return "Buzz" Input: num = 15 Output: "FizzBuzz" Explanation: 15 is divisible by both 3 and 5, so return "FizzBuzz" Input: num = 7 Output: "7" Explanation: 7 is not divisible by 3 or 5, so return the number as a string
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