moneyFmt method
Implementation
String moneyFmt({int digits = 2}) {
var splitText = (digits > 0 ? '.' : '');
if (this.textEmpty()) return '0' + splitText + ('0' * digits);
var numTmp = double.tryParse(this!);
return numTmp == null
? '0' + splitText + ('0' * digits)
: numTmp.mx_moneyFmt(digits: digits);
}