My first time coding want suggestions for optimization

Smart Contracts Review Wanted
1

Want to be able to have 1% fees going to my wallet and 1% burned every trade. Also saw someone implement a 0 fees before presale ends how can I implement that in my code? Please review and tell if this contract can work please also suggest improvements. Thanks! Also is there any automated way to do the testing?

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/presets/ERC20PresetFixedSupply.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/extensions/ERC20Burnable.sol";



contract testcoin is ERC20Burnable {
    
  

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    address TxFees = msg.sender;


    

 constructor(uint256 initialSupply) ERC20 ("testcoin", "tt"){
        _mint(msg.sender, initialSupply);
    }

       function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }


    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }
    
    function _transfer(address from, address to, uint256 amount) internal virtual override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

       uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
         uint256 amountToBurn = amount / 100;
         amount -= amountToBurn;
         _totalSupply -= amountToBurn;
        _balances[to] += amount;

         uint256 amountToTxFees = amount / 100;
         amount -= amountToTxFees;
         _balances[TxFees] += amountToTxFees;
        _balances[to] += amount;

        }

}