convertRegisterUserJsonFromString function
Converts a JSON string into a JSON string representing a RegisterModel object.
This function checks if the provided string is null or empty. If it is, it returns an empty string. Otherwise, it converts the string into a RegisterModel object using registerModelFromJson, and then back into a JSON string using registerModelToJson.
Parameters:
str - A JSON string or null.
Returns: A JSON string representing a RegisterModel object, or an empty string if the input is null or empty.
Implementation
String convertRegisterUserJsonFromString(String? str) =>
(str == null || str.isEmpty)
? ""
: json.encode(registerModelFromJson(str).toJson());