I am working with API keys and I need to be able to access the same unique API from two different screens. Basically, I need the dataKey variable in both screens, and I get the dataKey variable from the getKey() function, which has a get method that fetches the key. Right now the getKey() function is in one of the files (todolist.dart), but I don't know how to access it from my other file (add_new_item.dart).