internal void AddGroupMemberIntoResponse(ServerMessage response, GroupMember member)
{
response.AppendInteger(member.Rank == 2 ? 0 : member.Rank == 1 ? 1 : 2);
response.AppendInteger(member.Id);
response.AppendString(member.Name);
response.AppendString(member.Look);
response.AppendString(Yupi.GetGroupDateJoinString(member.DateJoin));
}