starMixText method
Implementation
String starMixText({bool isPhone = false}) {
var origin = '$this';
if (origin.length <= 4) return origin.mxText;
var startIdx = isPhone ? 3 : ((origin.length - 4) * 1 / 2).toInt();
var suffix =
(origin.length > startIdx + 4) ? origin.substring(startIdx + 4) : '';
return origin.substring(0, startIdx) + '*' * 4 + suffix;
}