method to get new cursor position for amount textWatcher

MainActivity.kt

private fun getNewCursorPosition(digitCountToRightOfCursor : Int, numberString : String) : Int{
        var position = 0
        var c = digitCountToRightOfCursor
        for (i in numberString.reversed()) {
            if (c == 0)
                break

            if (i.isDigit())
                c --
            position ++


        }
        return numberString.length - position
    }