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 func notifCenter() {
        let name = NSNotification.Name(rawValue: "updateWhatever")
        NotificationCenter.default.post(name: name, object: nil)  //e3mel post fe ay 7etta 3yz te send el notif ba3d mte7sal
        
        //in viewdidload observe this b2a
        NotificationCenter.default.addObserver(self, selector: #selector(whatHappensFunc), name: name, object: nil)
    }