al_ustr_remove_range - Allegro 5 API

       Remove  the  interval  [start_pos, end_pos) from a string.  start_pos and end_pos are byte offsets.  Both
       may be past the end of the string but cannot be less than 0 (the start of the string).

       Returns true on success, false on error.

       al_ustr_remove_range - Allegro 5 API

al_ustr_remove_chr(3alleg5), al_ustr_truncate(3alleg5)

Allegro reference manual                                                           al_ustr_remove_range(3alleg5)

              #include <allegro5/allegro.h>

              bool al_ustr_remove_range(ALLEGRO_USTR *us, int start_pos, int end_pos)