bool public tradingStarted;
uint256 public blocktime = 3;
uint256 public endBlock;

mapping(address => bool) private _isExcludedFromFees;
mapping(address => bool) private _isAutomatedMarketMakerPair;
mapping(address => bool) private _isBotAddress;
…

function setBlocktime(uint256 _blocktime) external onlyOwner {
require(!tradingStarted, "Cannot set blocktime after start trading");
require(_blocktime != blocktime, "Blocktime already same");
require(_blocktime <= 5, "Blocktime cannot more than 5 block");
blocktime = _blocktime;
emit UpdateBlocktime(_blocktime);
}

…
function _transfer(
address from,
address to,
uint256 amount
) internal override {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");

if (amount == 0) {
super._transfer(from, to, 0);
return;
}

require(
!_isBotAddress[from] && !_isBotAddress[to],
"Bot address cannot transfer"
);

if (!_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
require(tradingStarted, "Trading is not started yet");
if (from == uniswapV2Pair && block.number <= endBlock) {
_isBotAddress[to] = true;
emit BotAddressUpdated(to, true);
}
}

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