mint.sol

//Minting contract with mint_price and withdraw owner

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

contract CENTRA is ERC721, ERC721Enumerable, Pausable, Ownable, ERC721Burnable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;

    uint256 public MINT_PRICE = 0.05 ether;
    uint256 public MAX_SUPPLY = 100;

    constructor() ERC721("CENTRA", "CEN") {
        _tokenIdCounter.increment();
    }

    function _baseURI() internal pure override returns (string memory) {
        return "ipfs://QmehjD1qPwtS4LAHPw8LeKN6uLhzREvGFjXyKwycXrD41Q/";
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }

    function safeMint(address to) public payable {
        require(totalSupply() < MAX_SUPPLY, "Can't mint anymore");
        require(msg.value >= MINT_PRICE, "Not enough ether sent");
        uint256 tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId,
        uint256 batchSize
    ) internal override(ERC721, ERC721Enumerable) whenNotPaused {
        super._beforeTokenTransfer(from, to, tokenId, batchSize);
    }

    function withdraw() public onlyOwner {
        require(address(this).balance > 0, "Balance is zero");
        payable(owner()).transfer(address(this).balance);
    }

    // The following functions are overrides required by Solidity.

    function supportsInterface(
        bytes4 interfaceId
    ) public view override(ERC721, ERC721Enumerable) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}