plzzzz modify the below code plzzz urgent



global class Live_Date_Batch_Class implements Database.Batchable<sObject>{

        global Live_Date_Batch_Class(){
                   // Batch Constructor
        }
       
        // Start Method
        global Database.QueryLocator start(Database.BatchableContext BC){
        
            string query = 'select id,LastName from Contact WHERE Live_Date__c = TODAY';
            System.debug('aaaaaaaaaaaaaaaaaaaaaaaa'+query) ; 
            return Database.getQueryLocator(query);

        }

      // Execute Logic
       global void execute(Database.BatchableContext BC, List<Contact>scope){
            Set<Id> convertedIdSet = new Set<Id>();
           List<messaging.SingleEmailMessage>  emails = new List<messaging.SingleEmailMessage>();
            for(Contact contact : scope) {
            convertedIdSet.add(contact.id);
        }
 
           
       // opp.CloseDate = 'createddate+1'; 
       Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
       email.setToAddresses(new String[] {'srikanthyeturu123@gmail.com'});
       email.setSubject('opportunity closed date'); 
       email.setPlainTextBody('Dear user, Your opportunity closed date is tommorow');

       emails.add(email);
       
       Messaging.sendEmail(emails);
       
           
       }
            
       global void finish(Database.BatchableContext BC){
            // Logic to be Executed at finish
       }
    }