SilcBool silc_client_nickname_parse(SilcClient client,
                                        SilcClientConnection conn,
                                        char *nickname,
                                        char **ret_nick);

    Parses the `nickname' according to the format string given in the
    SilcClientParams.  Returns the parsed nickname into the `ret_nick'.
    The caller must free the returned pointer.  Returns FALSE if error
    occurred during parsing.  Returns TRUE if the nickname was parsed,
    it was not formatted or if the format string has not been specified
    in SilcClientParams.