appendQueryString function
Implementation
String? appendQueryString(String url, Map<String, dynamic>? args) {
if (args != null) {
args.forEach((key, val) {
if (val == null) return;
url += url.indexOf("?") >= 0 ? "&" : "?";
url += key + "=" + qsValue(val)!;
});
}
return url;
}