public static byte[] updateGP(int gid, int GP, int glevel) {
            MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();

            mplew.writeShort(SendPacketOpcode.GUILD_OPERATION.getValue());
            mplew.write(79);
            mplew.writeInt(gid);
            mplew.writeInt(GP);
            mplew.writeInt(glevel);


            return mplew.getPacket();
        }