fix SetPlayerBirthdayRsp

src/main/java/emu/grasscutter/server/packet/recv/HandlerSetPlayerBirthdayReq.java

 package emu.grasscutter.server.packet.recv;
 
-import emu.grasscutter.server.game.GameSession;
-import emu.grasscutter.server.packet.send.PacketGetPlayerSocialDetailRsp;
-import emu.grasscutter.server.packet.send.PacketSetPlayerBirthdayRsp;
-
 import emu.grasscutter.net.packet.Opcodes;
-import emu.grasscutter.net.packet.PacketOpcodes;
 import emu.grasscutter.net.packet.PacketHandler;
-
-import emu.grasscutter.net.proto.SocialDetailOuterClass.SocialDetail;
+import emu.grasscutter.net.packet.PacketOpcodes;
 import emu.grasscutter.net.proto.SetPlayerBirthdayReqOuterClass.SetPlayerBirthdayReq;
-
-import com.google.gson.Gson;
+import emu.grasscutter.net.proto.SocialDetailOuterClass.SocialDetail;
+import emu.grasscutter.server.game.GameSession;
+import emu.grasscutter.server.packet.send.PacketGetPlayerSocialDetailRsp;
+import emu.grasscutter.server.packet.send.PacketSetPlayerBirthdayRsp;
 
 @Opcodes(PacketOpcodes.SetPlayerBirthdayReq)
 public class HandlerSetPlayerBirthdayReq extends PacketHandler {
-	@Override
-	public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
-		SetPlayerBirthdayReq req = SetPlayerBirthdayReq.parseFrom(payload);
+    @Override
+    public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
+        SetPlayerBirthdayReq req = SetPlayerBirthdayReq.parseFrom(payload);
 
-		if(req.getBirth() != null && req.getBirth().getDay() > 0 && req.getBirth().getMonth() > 0)
-		{
-			int day = req.getBirth().getDay();
-			int month = req.getBirth().getMonth();
+        if (req.getBirthday().getDay() > 0 && req.getBirthday().getMonth() > 0) {
+            int day = req.getBirthday().getDay();
+            int month = req.getBirthday().getMonth();
 
-			// Update birthday value
-			session.getPlayer().setBirthday(day, month);
+            // Update birthday value
+            session.getPlayer().setBirthday(day, month);
 
-			// Save birthday month and day
-			session.getPlayer().save();
-			SocialDetail.Builder detail = session.getPlayer().getSocialDetail();
+            // Save birthday month and day
+            session.getPlayer().save();
+            SocialDetail.Builder detail = session.getPlayer().getSocialDetail();
 
-			session.send(new PacketSetPlayerBirthdayRsp(session.getPlayer()));
-			session.send(new PacketGetPlayerSocialDetailRsp(detail));
-		}
-	}
+            session.send(new PacketSetPlayerBirthdayRsp(session.getPlayer()));
+            session.send(new PacketGetPlayerSocialDetailRsp(detail));
+        }
+    }
 }

src/main/java/emu/grasscutter/server/packet/send/PacketSetPlayerBirthdayRsp.java

 package emu.grasscutter.server.packet.send;
 
-import emu.grasscutter.Grasscutter;
 import emu.grasscutter.game.GenshinPlayer;
 import emu.grasscutter.net.packet.GenshinPacket;
 import emu.grasscutter.net.packet.PacketOpcodes;
 import emu.grasscutter.net.proto.SetPlayerBirthdayRspOuterClass.SetPlayerBirthdayRsp;
-import emu.grasscutter.net.proto.BirthdayOuterClass.Birthday;
 
 public class PacketSetPlayerBirthdayRsp extends GenshinPacket {
     public PacketSetPlayerBirthdayRsp(GenshinPlayer player) {
         super(PacketOpcodes.SetPlayerBirthdayRsp);
 
         SetPlayerBirthdayRsp proto = SetPlayerBirthdayRsp.newBuilder()
-                .setBirth(player.getBirthday().toProto())
+                .setBirthday(player.getBirthday().toProto())
                 .build();
 
         this.setData(proto);