al_ustr_empty_string - Allegro 5 API

       Return a pointer to a static empty string.  The string is read only and must not be freed.

Allegro reference manual                                                           al_ustr_empty_string(3alleg5)

       al_ustr_empty_string - Allegro 5 API

              #include <allegro5/allegro.h>

              const ALLEGRO_USTR *al_ustr_empty_string(void)