#ifndef __LETTERS_H #define __LETTERS_H static private int valid_access(); string create_letter(string str); static private void save_letter(); static private int restore_letter(string id); string query_letter(string id); void delete_folder(string who, string folder, string id); void add_folder(string who, string folder, string id); static void manage_letters(); static void manage_postal(); #endif /* __LETTERS_H */