put_backslash - Puts a path separator at the end of a path if needed.
Allegro game programming library.
#include <allegro.h>
void put_backslash(char *filename);
If the last character of the filename is not a `\', `/', `#' or a
device separator (ie. `:' under DOS), this routine will concatenate
either a `\' or `/' on to it (depending on the platform). Note: ignore
the function name, it's out of date.
get_extension(3alleg), get_filename(3alleg)