To run the project, make sure you have installed dependencies including NPM and Node.js. Please edit the chainID in _app.js with the actual ID you want to build. The chainID 0x7f8c26 is currently offline, so please replace it.

function connect() {
    if (window.ethereum) {
      window.ethereum
        .request({
          method: "wallet_switchEthereumChain",
          params: [{ chainId: "0x7f8c26" }],
        })
        .then(checkNetwork)
        .catch((error) => {
          console.error("Error switching network:", error);
        });
    } else {
      console.error("Metamask extension not detected.");
    }
  }

  async function switchNetwork() {
    try {
      await ethereum.request({
        method: "wallet_addEthereumChain",
        params: [
          {
            chainId: "0x7f8c26",
            chainName: "meowbored",
            nativeCurrency: {
              name: "meowbored",
              symbol: "BLUED",
              decimals: 18,
            },
            rpcUrls: ["https://meowbored.pro/"],
          },
        ],
      });
    } catch (error) {
      console.error("Error switching to custom network:", error);
    }
  }

Inside the components folder, please also edit masterchefAddress and chainId in config.js.

const masterchefAddr = '0x7a843F02C34Ad1c56b7719048fc8E9Ce906CB11D';
const chainId = '0x7f8c26';

Deploy Masterchef smart contract on any network and use this smart contract.

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./n2drewards.sol";
import "./n2dpay.sol";

/*
*/

contract N2DMasterChefV1 is Ownable, ReentrancyGuard { 
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    struct UserInfo {
        uint256 amount; 
        uint256 pendingReward;
    }

     struct PoolInfo {
        IERC20 lpToken;
        uint256 allocPoint;
        uint256 lastRewardBlock;
        uint256 rewardTokenPerShare;
    }

    N2DRewards public n2dr;
    N2DRPay public n2drpay;
    address public dev;
    uint256 public n2drPerBlock;


    PoolInfo[] public poolInfo;
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;
    uint256 public totalAllocation = 0;
    uint256 public startBlock;
    uint256 public BONUS_MULTIPLIER;

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

constructor(
        N2DRewards _n2dr,
        N2DRPay _n2drpay,
        address _dev,
        uint256 _n2drPerBlock,
        uint256 _startBlock,
        uint256 _multiplier,
        address _initialOwner
    ) Ownable(_initialOwner) {
        n2dr = _n2dr;
        n2drpay = _n2drpay;
        dev = _dev;
        n2drPerBlock = _n2drPerBlock;
        startBlock = _startBlock;
        BONUS_MULTIPLIER = _multiplier;

        poolInfo.push(PoolInfo({
            lpToken: _n2dr,
            allocPoint: 1000,
            lastRewardBlock: startBlock,
            rewardTokenPerShare: 0
        }));
        totalAllocation = 1000;
    }

    modifier validatePool(uint256 _pid) {
        require(_pid < poolInfo.length, "pool Id Invalid");
        _;
    }

    function updateMultiplier(uint256 multiplierNumber) public onlyOwner {
        BONUS_MULTIPLIER = multiplierNumber;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    function checkPoolDuplicate(IERC20 _lpToken) public view {
        uint256 length = poolInfo.length;
        for (uint256 _pid = 0; _pid < length; _pid++) {
            require(poolInfo[_pid].lpToken != _lpToken, "add: existing pool");
        }
    }

    function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        checkPoolDuplicate(_lpToken);
        uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
        totalAllocation = totalAllocation.add(_allocPoint);
        poolInfo.push(PoolInfo({
            lpToken: _lpToken,
            allocPoint: _allocPoint,
            lastRewardBlock: lastRewardBlock,
            rewardTokenPerShare: 0
        }));
        updateStakingPool();
    }

    function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 prevAllocPoint = poolInfo[_pid].allocPoint;
        poolInfo[_pid].allocPoint = _allocPoint;
        if (prevAllocPoint != _allocPoint) {
            totalAllocation = totalAllocation.sub(prevAllocPoint).add(_allocPoint);
            updateStakingPool();
        }
    }

    function updateStakingPool() internal {
        uint256 length = poolInfo.length;
        uint256 points = 0;
        for (uint256 pid = 1; pid < length; ++pid) {
            points = points.add(poolInfo[pid].allocPoint);
        }
        if (points != 0) {
            points = points.div(3);
            totalAllocation = totalAllocation.sub(poolInfo[0].allocPoint).add(points);
            poolInfo[0].allocPoint = points;
        }
    }

    function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
        return _to.sub(_from).mul(BONUS_MULTIPLIER);
    }

    function pendingReward(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 rewardTokenPerShare = pool.rewardTokenPerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
            uint256 tokenReward = multiplier.mul(n2drPerBlock).mul(pool.allocPoint).div(totalAllocation);
            rewardTokenPerShare = rewardTokenPerShare.add(tokenReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(rewardTokenPerShare).div(1e12).sub(user.pendingReward);
    }

    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    function updatePool(uint256 _pid) public validatePool(_pid) {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        uint256 tokenReward = multiplier.mul(n2drPerBlock).mul(pool.allocPoint).div(totalAllocation);
        n2dr.mint(dev, tokenReward.div(10));
        n2dr.mint(address(n2drpay), tokenReward);
        pool.rewardTokenPerShare = pool.rewardTokenPerShare.add(tokenReward.mul(1e12).div(lpSupply));
        pool.lastRewardBlock = block.number;
    }

    function stake(uint256 _pid, uint256 _amount) public validatePool(_pid) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        updatePool(_pid);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.rewardTokenPerShare).div(1e12).sub(user.pendingReward);
            if(pending > 0) {
                safeN2drTransfer(msg.sender, pending);
            }
        }
        if (_amount > 0) {
            pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.pendingReward = user.amount.mul(pool.rewardTokenPerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _amount);
    }

    function autoCompound() public {
        PoolInfo storage pool = poolInfo[0];
        UserInfo storage user = userInfo[0][msg.sender];
        updatePool(0);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.rewardTokenPerShare).div(1e12).sub(user.pendingReward);
            if(pending > 0) {
                user.amount = user.amount.add(pending);
            }
        }
        user.pendingReward = user.amount.mul(pool.rewardTokenPerShare).div(1e12);
    }

    function unstake(uint256 _pid, uint256 _amount) public validatePool(_pid) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.amount >= _amount, "withdraw: not good");
        updatePool(_pid);
        uint256 pending = user.amount.mul(pool.rewardTokenPerShare).div(1e12).sub(user.pendingReward);
        if(pending > 0) {
            safeN2drTransfer(msg.sender, pending);
        }
        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        }
        user.pendingReward = user.amount.mul(pool.rewardTokenPerShare).div(1e12);
        emit Withdraw(msg.sender, _pid, _amount);
    }

    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.lpToken.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.pendingReward = 0;
    }

    function getPoolInfo(uint256 _pid) public view
    returns(address lpToken, uint256 allocPoint, uint256 lastRewardBlock, uint256 rewardTokenPerShare) {
        return (address(poolInfo[_pid].lpToken),
            poolInfo[_pid].allocPoint,
            poolInfo[_pid].lastRewardBlock,
            poolInfo[_pid].rewardTokenPerShare);
    }

    function safeN2drTransfer(address _to, uint256 _amount) internal {
        n2drpay.safeN2drTransfer(_to, _amount);
    }

    function changeDev(address _dev) public {
        require(msg.sender == dev, "Not Authorized");
        dev = _dev;
    }
}

install dependencies

npm i

test project

npm run dev