Inflation Token example

MyToken4.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";


//the token amount is twice whenever minted. if the mint_count is over 256, token amount is reseted. 
contract MyToken4 is ERC20 {

    uint public mint_count = 0;

    constructor() ERC20("Super Inflation Token", "SIT") {
        _mint(msg.sender, 1);
    }


    //free mint for everyone!
    function requestToken(uint amount) public {
        amount = amount * (10 ** decimals());
        _mint(msg.sender, _removeRate(amount));
        mint_count = mint_count + 1;
    }

    //change amount by mint_count
    function _applyRate(uint amount) internal view returns(uint) {
        return amount * (2 ** (mint_count%256));
    }
    function _removeRate(uint amount) internal view returns(uint) {
        return amount / (2 ** (mint_count%256));
    }



    function balanceOf(address account) public view virtual override returns (uint256) {
        return _applyRate(super.balanceOf(account));
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _applyRate(super.totalSupply());
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override {
        super._transfer(from, to, _removeRate(amount));
    }

    //no _applyRate for approve


}