@deftypefun {int} {tld_get_4z} (const uint32_t * @var{in}, char ** @var{out}) @var{in}: Zero terminated array of unicode code points to process. @var{out}: Zero terminated ascii result string pointer. Isolate the top-level domain of @code{in} and return it as an ASCII string in @code{out}. @strong{Return value:} Return @code{TLD_SUCCESS} on success, or the corresponding @code{Tld_rc} error code otherwise. @end deftypefun