My_Test_Repo/force-app/main/default/classes/RenewaloppClass.cls

public class RenewaloppClass{ 
     public static void RenewalOppMethod(List<Opportunity>Opplist){
        try{
            List<Opportunity> RenewalOpportunities = new List<Opportunity>();
            Id newrectypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('New Business').getRecordTypeId();
            Id RenewablerectypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('Renewable Business').getRecordTypeId();
            System.debug('@@@@@ +new Business Id:' + newrectypeId);
            System.debug('@@@@@ + Renewable Business Id:' + RenewablerectypeId);
            List<Opportunity>opplist2=new List<Opportunity>(Opplist);
            system.debug('@@@@@+ Getting Data'+opplist2);
            List<Opportunity>opt=new List<Opportunity>();
            for(Opportunity op : Opplist){
                System.debug('@@@@@ Opplist in loop'+Opplist);
                if (op.RecordTypeId == newrectypeId && op.StageName == 'Closed Won') {
                    Opportunity renewalOpp = new Opportunity();
                    System.debug('@@@@@@ inside the 1st loop'  );
                    // Set the fields for the Renewal Opportunity
                    renewalOpp.RecordTypeId = RenewablerectypeId;
                    renewalOpp.Name = op.Name + ' - Renewal';
                    renewalOpp.CloseDate = System.today() + 30;
                    renewalOpp.StageName = 'Renewal Ready';
                    renewalOpp.Parent_Opportunity__c = op.Id;
                    renewalOpportunities.add(renewalOpp); 
                    
                }
                else if (op.RecordTypeId == RenewablerectypeId && op.StageName == 'Closed Won'){
                    Opportunity renewalOpp = new Opportunity();
                    System.debug('@@@@@@ inside the 2nd loop'  );
                    // Set the fields for the Renewal Opportunity
                    renewalOpp.RecordTypeId = RenewablerectypeId;
                    renewalOpp.Name = op.Name + ' - Renewal';
                    renewalOpp.CloseDate = System.today() + 30;
                    renewalOpp.StageName = 'Renewal Ready';
                    renewalOpp.Parent_Opportunity__c = op.Id;
                    renewalOpportunities.add(renewalOpp); 
                    
                }
                else{
                    System.debug('@@@@ nothiggg');
                }
            }
            
            insert RenewalOpportunities;
        }
        catch(Exception e){
            System.debug('@@@@@ Error:' + e);
        }
     }       
    //For Update....
        public static void RenewaloppMethod2(Map<Id,Opportunity> nMap,Map<Id,Opportunity> oMap){
        try {
            List<Opportunity> RenewalOpportunities = new List<Opportunity>();
            Boolean exist=False;
            Id newrectypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('New Business').getRecordTypeId();
            Id RenewablerectypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('Renewable Business').getRecordTypeId();
            
            System.debug('@@@@@ +new Business Id:' + newrectypeId);
            System.debug('@@@@@ + Renewable Business Id:' + RenewablerectypeId);
            Set<Id> idd = new Set<Id>(); // Use set<Id> to store Id values
            
            //getting id from nMap
            for (Opportunity od1 : nMap.values()) {
                idd.add(od1.Id); // Add the Id value to the list using the add() method
            } 
            
           
            List<Opportunity> oppt = [SELECT Parent_Opportunity__c FROM Opportunity WHERE RecordTypeId=:RenewablerectypeId AND Parent_Opportunity__c IN :idd];
            system.debug('@@@@@ Opppp id value'+oppt);
            
             //getting those opportunities which has already child in related And stroring them into set of id
            Set<Id> set1 = new Set<Id>();
            for(Opportunity ol: [SELECT Parent_Opportunity__c FROM Opportunity WHERE RecordTypeId=:RenewablerectypeId AND Parent_Opportunity__c IN :idd]){
                set1.add(ol.Parent_Opportunity__c);
            }
            
            //updating value of exist  
            for(Opportunity opl :nMap.values()){
                system.debug('@@@@@ in loop');
                if(set1.contains(opl.Id)){
                    exist=True;
                    system.debug('coantans???'+exist);
                }
                else{
                    exist=False;
                    system.debug('coantans???'+exist);
                } 
                //checking the conditions
                if(oMap.get(opl.Id).StageName!=nMap.get(opl.Id).StageName && nMap.get(opl.Id).StageName=='Closed Won' && exist==False){
                    
                    if (opl.RecordTypeId == newrectypeId || opl.RecordTypeId == RenewablerectypeId ) {
                        Opportunity renewalOpp = new Opportunity();
                        
                        system.debug('Making record');
                        
                        // Set the fields for the Renewal Opportunity
                        renewalOpp.RecordTypeId = RenewablerectypeId;
                        renewalOpp.Name = opl.Name + ' - Renewal';
                        renewalOpp.CloseDate = System.today() + 30;
                        renewalOpp.StageName = 'Renewal Ready';
                        renewalOpp.Parent_Opportunity__c = opl.Id;
                        RenewalOpportunities.add(renewalOpp);    
                    }
                
                    else{
                        System.debug('@@@@@@ no Criteria matched');
                    }
                }
                else{
                    System.debug('Record already attached');
                }
                
                
                insert RenewalOpportunities;
            } 
        }
        catch(Exception e){
            System.debug('@@@@ Error:' + e);
        }
    }
     
}