don't give full exp for not last hit

src/ship/packet/handler/message.rs

@@ -29,20 +29,27 @@ pub async fn request_exp<EG: EntityGateway>(id: ClientId,
     let monster = room.maps.enemy_by_id(request_exp.enemy_id as usize)?;
     let monster_stats = room.monster_stats.get(&monster.monster).unwrap();
 
+    let exp_gain = if request_exp.last_hitter == 1 {
+        monster_stats.exp
+    }
+    else {
+        ((monster_stats.exp as f32) * 0.8) as u32
+    };
+
     let clients_in_area = client_location.get_clients_in_room(room_id).map_err(|err| -> ClientLocationError { err.into() })?;
-    let gain_exp_pkt = builder::message::character_gained_exp(area_client, monster_stats.exp);
+    let gain_exp_pkt = builder::message::character_gained_exp(area_client, exp_gain);
     let mut exp_pkts: Box<dyn Iterator<Item = _> + Send> = Box::new(clients_in_area.clone().into_iter()
         .map(move |c| {
             (c.client, SendShipPacket::Message(Message::new(GameMessage::GiveCharacterExp(gain_exp_pkt.clone()))))
         }));
 
     let before_level = level_table.get_level_from_exp(client.character.char_class, client.character.exp);
-    let after_level = level_table.get_level_from_exp(client.character.char_class, client.character.exp + monster_stats.exp);
+    let after_level = level_table.get_level_from_exp(client.character.char_class, client.character.exp + exp_gain);
     let level_up = before_level != after_level;
 
     if level_up {
         let (_, before_stats) = level_table.get_stats_from_exp(client.character.char_class, client.character.exp);
-        let (after_level, after_stats) = level_table.get_stats_from_exp(client.character.char_class, client.character.exp + monster_stats.exp);
+        let (after_level, after_stats) = level_table.get_stats_from_exp(client.character.char_class, client.character.exp + exp_gain);
 
         let level_up_pkt = builder::message::character_leveled_up(area_client, after_level, before_stats, after_stats);
         exp_pkts = Box::new(exp_pkts.chain(clients_in_area.into_iter()
@@ -51,7 +58,7 @@ pub async fn request_exp<EG: EntityGateway>(id: ClientId,
             })))
     }
 
-    client.character.exp += monster_stats.exp;
+    client.character.exp += exp_gain;
     entity_gateway.save_character(&client.character).await;
 
     Ok(exp_pkts)