compress function
Implementation
String compress(String _data){
List<int> stringBytes = utf8.encode(_data);
List<int>? gzipBytes = GZipEncoder().encode(stringBytes);
String compressedString = base64.encode(gzipBytes!);
// print("compressed string: $compressedString");
// print("compressed length: ${compressedString.length}");
return compressedString;
}