isPercent function
Check if a String is a percentage value
Implementation
bool isPercent(dynamic s) {
if (s == null) return false;
if (s is! String) return false;
try {
if (s.endsWith("%")) {
s = s.split("%")[0];
return isNumeric(s);
}
} catch (e) {
Log().debug('$e');
}
return false;
}