urlEncode function
Implementation
String urlEncode(Map data) {
String encodedData = '';
for (int i = 0; i < data.keys.toList().length; i++) {
final key = data.keys.toList()[i];
encodedData = encodedData + '$key=${data[key]}';
if (i < data.keys.toList().length - 1) encodedData = encodedData + '&';
}
return encodedData;
}