Lamda

fun fixAppend(displayStr: StringBuilder, digit: String, txtView: TextView): Boolean {
    if (displayStr.length <= 11) {
        displayStr.append(digit)
        var newAmount = displayStr.toString().toDouble()
        // fix new input
        newAmount *= 10.00
        if ("00" == digit) newAmount *= 10.00


        val updatedAmount = DecimalFormat("0.00").format(newAmount)
        txtView.text = updatedAmount.toString()
//            binding.txtAmount.text = updatedAmount.toString()
    }
    return true
}

fun fixDelete(displayStr: StringBuilder, textView: TextView) {
    var bd = BigDecimal(displayStr.toString())
    bd = bd.movePointLeft(1)
    textView.text = bd.toString()
//        binding.txtAmount.text = bd.toString()
}