function desensitization(string="", start, end) {
    var star = ''
		var length = string.length
    function makeStar(number) {
        if (number > 0) {
            star += '*';
            return makeStar(--number)
        } else {
            return star
        }
		};
		if(length < end) {
			return string.substring(0, 1) + makeStar(length-2>0?length-2:0) + (length>2?string.substring(length-1):"")
		}
    return string.substring(0, start) + makeStar(end - start) + string.substring(end)
}
function indexOf(array, value) {
    return array.indexOf(value)
}

module.exports = {
    desensitization: desensitization,
    indexOf:indexOf,
}