al_cstr_dup - Allegro 5 API

       Create a NUL ('\0') terminated copy of the string.  Any embedded NUL bytes will still be presented in the
       returned string.  The new string must eventually be freed with al_free(3alleg5).

       If an error occurs NULL is returned.

       al_cstr_dup - Allegro 5 API

al_cstr(3alleg5), al_ustr_to_buffer(3alleg5), al_free(3alleg5)

Allegro reference manual                                                                    al_cstr_dup(3alleg5)

              #include <allegro5/allegro.h>

              char *al_cstr_dup(const ALLEGRO_USTR *us)