Concatenates a filename to a path.


char *append_filename(char *dest, const char *path, const char *filename, int size);
Concatenates the specified filename onto the end of the specified path, storing at most `size' bytes into the `dest' buffer. If `path' doesn't have a trailing path separator, the function will append one if needed. You can use the same buffer both as input and output because Allegro internally works on a copy of the input before touching `dest'. Example:
      append_filename(buf, "/home/user",
		      "prog.bin", sizeof(buf));
Returns a copy of the `dest' parameter.
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