can you add the $2.$ code into first code

$1)$package observer.log

import scala.collection.mutable.$\{$Set $=>$ mSet, ListBuffer$\}$

trait Loggable$[$Subject$,$ Delta$]$:

val observers: mSet$[$LoggingObserver$[$Subject$,$ Delta$]]=$ mSet.empty

private var timestamp: Long $=\_$

def attach$($observer: LoggingObserver$[$Subject$,$ Delta$])$: Unit $=\{$

observers $+=$ observer

$\}$

def notifyAllObservers$($delta: Delta$)$: Unit $=\{$

timestamp $=$ System.currentTimeMillis$()$

observers.foreach$($observer $=>$ observer.update$($delta$))$

$\}2)$class ConcreteSubject extends Loggable $\{$

private var state: String $=\_$

def setState$($state: String$)$: Unit $=\{$

this.state $=$ state

notifyAllObservers$()$

$\}$

def getState$()$: String $=\{$

return state

$\}$

$\}$