al_ustr_has_prefix - Allegro 5 API

       Returns true iff us1 begins with us2.

       al_ustr_has_prefix - Allegro 5 API

al_ustr_has_prefix_cstr(3alleg5), al_ustr_has_suffix(3alleg5)

Allegro reference manual                                                             al_ustr_has_prefix(3alleg5)

              #include <allegro5/allegro.h>

              bool al_ustr_has_prefix(const ALLEGRO_USTR *us1, const ALLEGRO_USTR *us2)