generateHierarchyMap method
Implementation
Future<String> generateHierarchyMap(String endpoint) async {
final Uri url = Uri.parse('$rootApi$endpoint');
await _applyInterceptors(url, defaultHeaders);
final response = await _makeRequest(() => http.get(url, headers: defaultHeaders));
final data = jsonDecode(response.body);
return _buildHierarchy(data);
}