stralloc_chop - remove and return last char

       stralloc_chop  removes  the  last  char  in  the stralloc (if it is empty, stralloc_chop does nothing and
       returns -1).  This character is cast to unsigned char and returned.

       stralloc_chop - remove and return last char

       chopped character, or -1 if string was empty.

stralloc_chomp(3)

                                                                                                stralloc_chop(3)

#include<libowfat/stralloc.h>

       int stralloc_chop(stralloc* sa);