contact client trigger - AI / AU

// Create a field on Account Named (Client Contact lookup to Contact). Once an Account is inserted a Contact will create with the name of the Account and that Contact will be the Client Contact on the Account.

trigger accClientContact on Account(after Insert, after update){

if(trigger.isAfter){
    if(trigger.isInsert){
    accountHandler.afterInsert(trigger.new);
}if(trigger.isUpdate){
    accountHandler.afterUpdate(trigger.new, trigger.oldMap);
}

}

public with sharing class accountHandler {
    public static string afterInsert(list<Account> accNew){
        if(!accNew.isEmpty()){
            Map<Id,Contact> updatedContacts = new Map<Id,Contact>();
            for(Account aObj : accNew){
                Contact cc = new Contact();
                    cc.AccountId = aObj.Id;
                    cc.LastName = aObj.Name;
                    updatedContacts.put(aObj.Id, Contact);
            }
            if(!updatedContacts.isEmpty()){
                    INSERT udpatedContacts;
                List<Account> udpatedAccount = new List<Account>();
                for(Account aObj : accNew){
                    if(udpateContacts.containsKey(aObj.Id){
                        aObj.Client_Contact__c = updateContact.get(aObj).Id;
                        updatedAccount.add(aobj);
                    }
                }
            }
                       if(!updatedAccount.isEmpty()){
                           insert udpatedAccount;
                       }
        }

    } public static List<Account> afterUpdate(list<Account> accNew, Map<Id,Account> oldAccMap){
        if(accNew.isEmpty() && oldAccMap.isEmpty()) return;


            list<Contact> updatedContacts = new list<contact>();
            Map<Id, Id> AccountToContactMapping = new Map<Id, Id>();
            for(Account aObj : accNew){
                if(aObj.Client_contact__c != oldAccMap.get(aObj.Id).contact_client__c){
                    Contact cc = new Contact();
                    cc.AccountId = aObj.Id;
                    cc.LastName = aObj.Name;
                    updatedContacts.add(cc);
                }// end if
                else{
                    free();
                } //end else
        }// end for

        // Buld Insert New Contact
             if(!updatedContats.isEmpty()){
                Databae.SaveResults[] conInsert = Database.Insert(updatedContats, false); // partial insert is allowed
                for( integer i =0 ; i < conInsert.size(); i++){
                    if(conInsert[i].isSuccess){
                        Contact insertedContact = updatedContacts[i];
                        AccountToContactMapping.put(insetedContact.AccountId, insertedContact.Id);
                    }else{
                        system.debug('Error while inserting contact'+conInsert[i].getError();
                }
            }
                list<Account> accountUpdates = new list<Account>();
                for( Account aObj : accNew){
                    aObj.Client_contact__c = AccountToContact.get(aObj.Id);
                    accountUpdates.add(aObj);
                }
            if(!accountUpdates.isEmpty()){
                Database.SaveResults[] accResults = Databse.Update(accountUpdates, false);
                for(integer i = 0; i<accResults.size(); i++){
                    if(!accResults[i].isSuccess){
                        system.debug('Error while updating account'+accResults[i].getError();
                    }
                }
            }

    }