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17/**
18 * @notice Mint token of `id` to `to`
19 * @param to Address to mint token to
20 * @param tokenId Token id to mint
21 * @dev The caller must be allowed to mint
22 */
23function mint(address to, uint256 tokenId) public virtual onlyMinter {
24    if (to == address(0)) {
25        revert ERC721InvalidReceiver(address(0));
26    }
27    address previousOwner = _update(to, tokenId, address(0));
28    if (previousOwner != address(0)) {
29        revert ERC721InvalidSender(address(0));
30    }
31}
32
33/**
34 * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.
35 *
36 * Requirements:
37 *
38 * - `tokenId` must not exist.
39 * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
40 *
41 * Emits a {Transfer} event.
42 */
43function safeMint(address to, uint256 tokenId) public onlyMinter {
44    safeMint(to, tokenId, "");
45}
46
47/**
48 * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
49 * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
50 */
51function safeMint(address to, uint256 tokenId, bytes memory data) public onlyMinter {
52    mint(to, tokenId);
53    _checkOnERC721Received(_msgSender(), to, tokenId, data);
54}