A basic crowdfunding smart contract

Crowdfund.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

// AGENDA  
// Develop a crowdfund smart contract
// Adhere to best practices
// Transfer & withdrawal support
// Support for locked deposits
// Support for pull out window
// Multiple/concurrent funding

contract Crowdfund {
    uint target;
    uint public amountFunded;
    address owner;
    uint deadline;
    mapping(address => uint) contributors;
    enum State {
        Closed,
        Open
    }
    State state = State.Open;

    constructor (uint _target, uint _deadline) {
        owner = msg.sender;
        target = _target;
        deadline = _deadline;
    }

    function fund () public payable {
        require(block.timestamp < deadline, "Deadline has passed");
        contributors[msg.sender] += msg.value;
        amountFunded += msg.value;
    }

    function withdraw() public {
        require(msg.sender == owner, "Only the owner can call this function");
        require(block.timestamp > deadline, "Deadline not yet reached");
        
        uint amountToSend = amountFunded;
        amountFunded = 0;
        state = State.Closed;
        payable(owner).transfer(amountToSend);
    }

    function getContribution() public view returns (uint) {
        return contributors[msg.sender];
    }

    function pullOutContribution () public {
        uint contribution = contributors[msg.sender];
        contributors[msg.sender] = 0;
        amountFunded -= contribution;
        payable(msg.sender).transfer(contribution);
    }
}