Reduce nesting depth, also fix #173

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/contact/GroupImpl.kt

@@ -63,7 +63,9 @@ internal class GroupImpl(
     groupInfo: GroupInfo,
     members: Sequence<MemberInfo>
 ) : Group() {
-    companion object;
+    companion object
+
+    val lastRecalledMessageRandoms: LockFreeLinkedList<Int> = LockFreeLinkedList()
 
     override val bot: QQAndroidBot by bot.unsafeWeakRef()
 

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/Packet.kt

@@ -25,12 +25,6 @@ interface Packet {
 }
 */
 
-internal object NoPacket : Packet {
-    override fun toString(): String {
-        return "NoPacket"
-    }
-}
-
 /**
  * PacketFactory 可以一次解析多个包出来. 它们将会被分别广播.
  */

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/data/jce/PushNotifyPack.kt

@@ -42,7 +42,7 @@ internal class MsgInfo(
     @JceId(3) val shMsgSeq: Short,
     @JceId(4) val strMsg: String?,
     @JceId(5) val uRealMsgTime: Int?,
-    @JceId(6) val vMsg: ByteArray?,
+    @JceId(6) val vMsg: ByteArray,
     @JceId(7) val uAppShareID: Long?,
     @JceId(8) val vMsgCookies: ByteArray? = EMPTY_BYTE_ARRAY,
     @JceId(9) val vAppShareCookie: ByteArray? = EMPTY_BYTE_ARRAY,

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/data/proto/OnlinePush.kt

@@ -29,13 +29,13 @@ internal class MsgOnlinePush {
 @Serializable
 internal class OnlinePushTrans : ProtoBuf {
     @Serializable
-internal class ExtGroupKeyInfo(
+    internal class ExtGroupKeyInfo(
         @ProtoId(1) val curMaxSeq: Int = 0,
         @ProtoId(2) val curTime: Long = 0L
     ) : ProtoBuf
 
     @Serializable
-internal class PbMsgInfo(
+    internal class PbMsgInfo(
         @ProtoId(1) val fromUin: Long = 0L,
         @ProtoId(2) val toUin: Long = 0L,
         @ProtoId(3) val msgType: Int = 0,