Get ready for Scamp the Tramp

Scamp.sol

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.4;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";


contract Scamp is ERC20 {
    using SafeERC20 for IERC20;

    IERC20 public constant inv = IERC20(address(0x41D5D79431A913C4aE7d69a668ecdfE5fF9DFB68));
    
    constructor() ERC20("Scamp", "SCAMP") {}
    
    function decimals() public pure override returns (uint8) {
        return 8;
    }
    
    function happyTailwag(uint256 happiness) external returns (bool) {
        uint256 inv_balance = inv.balanceOf(msg.sender);
        uint256 mint_amount = happiness < inv_balance ? happiness : inv_balance;
        
        inv.safeTransferFrom(msg.sender, address(this), mint_amount);
        _mint(msg.sender, mint_amount);

        return true;
    }
    
    function sadTailwag(uint256 sadness) external returns (bool) {
        uint256 burn_amount = sadness < balanceOf(msg.sender) ? sadness : balanceOf(msg.sender);
        
        _burn(msg.sender, burn_amount);
        inv.safeTransfer(msg.sender, burn_amount);
        
        return true;
    }
}