在 remix IDE 中编译我的代码时遇到问题

尝试编写石头、纸、剪刀游戏，但无法编译合约代码：

我得到的当前错误是： ParserError: Expected '(' but got identifier -->

我想我在某处遗漏了 { 或 )，但我不确定在哪里。帮助表示赞赏！

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// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Game {

    uint8 constant ROCK = 0;
    uint8 constant PAPER = 1;
    uint8 constant SCISSORS = 2;
    address[] public players;

    // the public keyword will create a function with the same name as the mapping which will allow us to lookup the key outside the contract
    // no data is ever hidden in a smart contract deployed on a public chain and using `private` will not hide data in any way.
    mapping(address => uint8) public choices;
    
    
    function enroll() public payable {
        require(msg.value > .01 ether);

        players.push(msg.sender);
    }

    function play(uint8 choice) external {
        // check that the move is valid
        require(choice == ROCK || choice == PAPER || choice == SCISSORS);
        // check that the player hasnt played the move already
        require(choices[msg.sender] == 0);
        // set the choice for the players address
        choices[msg.sender] = choice;
    }

  function evaluate(address alice, address bob)
        public
        view
        returns (address add)
    {
        // if the choices are the same, the game is a draw, therefore returning 0x0000000000000000000000000000000000000000 as the winner
        if (choices[alice] == choices[bob]) {
            return address(0);
        }

        // paper beats rock bob/alice
        if (choices[alice] == ROCK && choices[bob] == PAPER) {
            return bob;
            // paper still beats rock (played in opposite alice/bob)
        } else if (choices[bob] == ROCK && choices[alice] == PAPER) {
            return alice;
        } else if (choices[alice] == SCISSORS && choices[bob] == PAPER) {
            return alice;
        } else if (choices[bob] == SCISSORS && choices[alice] == PAPER) {
            return bob;
        } else if (choices[alice] == ROCK && choices[bob] == SCISSORS) {
            return alice;
        } else if (choices[bob] == ROCK && choices[alice] == SCISSORS) {
            return bob;
        }

    
    function pickWinner(address bob, address alice) public payable {
        if (evaluate(alice, bob) == bob) {
            bob.transfer(address(this).balance);
        }
        if (evaluate(alice, bob) == alice) {
            alice.transfer(address(this).balance);
        }
        players = new address[](0);
    }
    }        

        
        
    
   
}