public static byte[] changeRank(MapleGuildCharacter mgc) {
            MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();

            mplew.writeShort(SendPacketOpcode.GUILD_OPERATION.getValue());
            mplew.write(92);
            mplew.writeInt(mgc.getGuildId());
            mplew.writeInt(mgc.getId());
            mplew.write(mgc.getGuildRank());


            return mplew.getPacket();
        }