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// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
contract SixteenDao is Ownable, ERC721URIStorage {
    using Counters for Counters.Counter;
    address[] private alreadyPurchasedList;
    Counters.Counter private _tokenIdCounter;
    uint256 private _totalSupply;
    uint256 private allowTotalSupply = 2000;
    string private _base_pass_img_url =
        "https://ipfs.io/ipfs/QmUXet5vtM5FVq5tNJjBshqhvh8H4tcfkDcKKNVLQpGNEw";
    constructor() ERC721("DZ Novel DeFi Labs", "ONE PASS CARD") {}
    function getCurrentIndex() public view returns (uint256) {
        uint256 tokenId = _tokenIdCounter.current();
        return tokenId;
    }
    function publicMint(address to) public payable {
        for (uint256 i = 0; i < alreadyPurchasedList.length; i++) {
            address addr = alreadyPurchasedList[i];
            if (addr == to) {
                revert(" can buy  only once ");
            }
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