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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.13;

contract FizzBuzz {
    function fizzBuzz(uint256 n) public pure returns (string memory) {
        // if n is divisible by 3, return "fizz"
        // if n is divisible by 5, return "buzz"
        // if n is divisible be 3 and 5, return "fizz buzz"
        // otherwise, return an empty string
        string memory s = "";
        if (n % 3 == 0) s = "fizz";
        if (n % 5 == 0) {
            if (bytes(s).length > 0) 
                s = string.concat(s, " ") ;
            s = string.concat(s, "buzz") ;
        }
        return s;
    }
}