collect all money in coinbase

function sendAll(accountNum, coinbase) {
    var accs = eth.accounts;
    personal.unlockAccount(accs[accountNum]);
    var amount_to_send_eth = web3.fromWei(eth.getBalance(accs[accountNum]), "ether");
    var amount_to_send_wei = amount_to_send_eth *1000000000000000000;
    var transactionFee = web3.eth.gasPrice * 22000;
    var total_amount_to_send_wei = amount_to_send_wei - transactionFee;
    console.log(total_amount_to_send_wei);
    eth.sendTransaction({from:eth.accounts[accountNum], to: eth.accounts[0], value: total_amount_to_send_wei });
}

function collect(coinbase) {
    var accs = eth.accounts;
    for (var acctNum in accs) {
        if (accs[acctNum] == coinbase) {
            console.log("skip coinbase");
            continue;
        }
        if (eth.getBalance(accs[acctNum]) < 210000000000000){
            console.log("skip small amount tx");
            continue;
        }
        sendAll(acctNum, coinbase);
    }
}

// for example cold wallet from bsc testnet dev
collect("0x91735ef23d55cc7c5f31fca74cf2dcc9ff3015a6");