My email handler works fine for if condition.. but not for else... 
following is my code..:-

global class emailhandler2 implements Messaging.InboundEmailHandler {


  global Messaging.InboundEmailResult handleInboundEmail(messaging.inboundemail email, messaging.inboundenvelope envelope)
  {
  
  WeatherCheckIn__c[] newWeathercheckIn = new WeatherCheckIn__c[0];
  
    String subject = email.subject;
   
   String[] emailsub = email.subject.split('#', 0);
   String country = emailsub[0];
   String city = emailsub[1];
   string[] emailaddressr = envelope.fromaddress.split('@',0);
   string lastnamer = emailaddressr[0];
 system.debug('^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^'+lastnamer);
     Xmlparsercls obj = new Xmlparsercls(city, country);
     list<string> ls = obj.Parsexmlfile();
     
     list<contact> dulast =[select id, lastname from contact where lastname= :lastnamer];
     
     for(contact x : dulast){
     
        if(x.lastname != lastnamer) {
     
     system.debug('//////////////////////////////////////////x.lastname!=lastnamer//////////'+x.lastname);
      
   
   Contact c = new Contact();
   
      c.LastName = lastnamer;
      
      insert c;
       WeatherCheckIn__c wcic = new WeatherCheckIn__c();
        wcic.City__c = city;
        wcic.Country__c = country;
        wcic.Contact__c = c.id;
      newWeathercheckIn.add(new WeatherCheckIn__c(City__c = city,
      Country__c = country));
      insert wcic;
       WeatherCheckOut__c wechou= new WeatherCheckOut__c();
   
   wechou.Location__c = ls[0].substring(24,75);
   wechou.Temperature__c = ls[0].substring(88,100);
   wechou.DewPoint__c = ls[0].substring(110,120);
   wechou.Contact__c = c.id;
   insert wechou;
   
   }
    
     
     else{
  
   system.debug('############################################# x.lastname==lastnamer ####'+x.lastname);
   
  
 WeatherCheckIn__c wcic = new WeatherCheckIn__c();
        wcic.City__c = city;
        wcic.Country__c = country;
        wcic.Contact__c = x.id;
      newWeathercheckIn.add(new WeatherCheckIn__c(City__c = city,
      Country__c = country));
      insert wcic;
       WeatherCheckOut__c wechou= new WeatherCheckOut__c();
   
   wechou.Location__c = ls[0].substring(24,75);
   wechou.Temperature__c = ls[0].substring(88,100);
   wechou.DewPoint__c = ls[0].substring(110,120);
   wechou.Contact__c = x.id;
   insert wechou;
   
   update x;
   }
        }
     system.debug('----------------------------------------subject--------------------'+subject);
       system.debug('--------------------------------------------------country--'+country);
       system.debug('--------------------------------------------city---------'+city);
  
      
       system.debug('............................................................................................................'+ls[0].substring(24,75)+ls[0].substring(88,100)+ls[0].substring(110,120));
      
    Messaging.InboundEmailresult result = new Messaging.InboundEmailResult();
    result.message = 'Your mail has been recieved'+ls;
  
    return result;
  }
}