Master Blockchain Development

pragma solidity ^0.8.0;

contract EduchainLab {
    mapping(address => uint256) public userScores;
    address public owner;
    event ScoreUpdated(address user, uint256 score);

    constructor() {
        owner = msg.sender;
    }

    function updateScore(address user, uint256 score) public {
        require(msg.sender == owner, "Only owner can update scores");
        userScores[user] = score;
        emit ScoreUpdated(user, score);
    }
}