splitting contracts

src/Mailbomb.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+
+/******* Mint Mechanics 
+.00 per unaboomer (BOOMR) - 10k supply
+.02 per bomb (BOMB) - infinite supply
+BOMB holders can randomly mail bombs to other owners
+1 BOMB kills 1 BOOMR - BOOMR image switches to explosion after being bombed
+chaos ensues until 1000 survivors - the game stops
+********/
+
+import {ERC721} from "solmate/tokens/ERC721.sol";
+import {Owned} from "solmate/auth/Owned.sol";
+import {LibString} from "solmate/utils/LibString.sol";
+
+error NotEnoughEther();
+error NotOwnerOfToken();
+error MaxSupplyReached();
+error TooMany();
+error NoContract();
+error WrongEtherAmount();
+error MaxAmountReached();
+error NoAdmins();
+error NotAdmin();
+error NoRemoveSelf();
+error NoRemoveDeployer();
+
+contract Mailbomb is ERC721, Owned {
+    using LibString for uint256;
+
+    mapping(uint256 => bool) public tokenDead;
+
+    uint256 public constant MAX_SUPPLY = 10000;
+    uint256 public price = 0.01 ether;
+    uint256 public minted;
+    string public aliveURI;
+    string public deadURI;
+    address public MailBombContract;
+
+    constructor() ERC721("Unaboomer", "BOOMR") Owned(msg.sender) {}
+
+    // =========================================================================
+    //                              Admin
+    // =========================================================================
+
+    /// Withdraw funds to contract owner
+    function withdraw() external onlyOwner {
+        uint256 balance = address(this).balance;
+        payable(msg.sender).transfer(balance);
+    }
+
+    /// Set price for PFP + 2 BOMB
+    function setPrice(uint256 _price) external onlyOwner {
+        price = _price;
+    }
+
+    /// Set metadata URI for alive BOOMR
+    function setAliveURI(string calldata _baseURI) external onlyOwner {
+        aliveURI = _baseURI;
+    }
+
+    /// Set metadata URI for dead BOOMR
+    function setDeadURI(string calldata _baseURI) external onlyOwner {
+        deadURI = _baseURI;
+    }
+
+    /// Set contract address for Mailbomb tokens
+    function setMailBombContract(address _address) external onlyOwner {
+        MailBombContract = _address;
+    }
+
+    // =========================================================================
+    //                              Tokens
+    // =========================================================================
+
+    function mint(uint256 _amount) external payable {
+        if (msg.sender == tx.origin) revert NoContract();
+        if (_amount > 20) revert TooMany();
+        if (msg.value < _amount * price) revert NotEnoughEther();
+        if (minted + _amount > MAX_SUPPLY) revert MaxSupplyReached();
+        unchecked {
+            for (uint256 i; i < _amount; i++) {
+                _mint(msg.sender, minted + 1);
+                minted++;
+            }
+        }
+        // also mint 2 BOMB to user
+    }
+
+    function totalSupply() view public returns (uint256 supply) {
+        return minted;
+    }
+
+    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
+        if (tokenDead[_tokenId]) {
+            return string(abi.encodePacked(deadURI, _tokenId.toString(), ".json"));
+        } else {
+            return string(abi.encodePacked(aliveURI, _tokenId.toString(), ".json"));
+        }
+    }
+
+    function supportsInterface(bytes4 interfaceId) public view virtual override (ERC721) returns (bool) {
+        return super.supportsInterface(interfaceId);
+    }
+}