old_contents: 
  export const API_URL = 'https://play.dhis2.org/test/api';
  export const API_DATASTORE_URL = 'https://play.dhis2.org/test/api/dataStore';
  
new_contents: 
  export const API_URL = 'https://play.dhis2.org/test/api';
  export const API_DATASTORE_URL = API_URL+'/dataStore';
  
subject: use API_URL const to declare other constant so the url can be change only in one place