SilcClientEntry
    silc_client_nickname_format(SilcClient client,
                                SilcClientConnection conn,
                                SilcClientEntry client_entry,
                                SilcBool priority);

    Formats the nickname of `client_entry' according to the nickname
    formatting rules set in SilcClientParams.  If the `priority' is TRUE
    then the `client_entry' will always get the unformatted nickname.
    If FALSE and there are more than one same nicknames in the client
    the nickname will be formatted.

    This returns NULL on error.  Otherwise, the client entry that was
    formatted is returned.  If `priority' is FALSE this always returns
    the `client_entry'.  If it is TRUE, this may return the client entry
    that was formatted after giving the `client_entry' the unformatted
    nickname.

    Usually application does not need to call this function, as the library
    automatically formats nicknames.  However, if application wants to
    for example force the `client_entry' to always have the unformatted
    nickname it may call this function to do so.