Hello team, 

I am developing a merging app but I cannot find to way to merge what I need. A have a multiple selection for all the accounts I want to merge and the Master Account. 
Here is the code: 
 

public class MyAccountListCntrlr {
    // PROPERTIES
    public List<AccountWrapperCls> acctList {get;set;}
    public Set<String> selAccountNames {get;set;}
    public Boolean hasSelAcct {get;set;}
    public static List<Account> accts;
    
    //	MESSAGE
    public static  Boolean showMessage {get;set;}
	public static String message {get;set;}
    
    public static List<Account> acct;//Account 1
    public static List<Account> acct2;//Account 2
    
    
    public static String sAccount{set;get;}//Selection of the Master Account
    //See the method getItems
    
    
     // CONSTRUCTOR
     public MyAccountListCntrlr(){
          acctList = new List<AccountWrapperCls>();
          selAccountNames = new Set<String>();
         showMessage = false;
          for(Account a : [SELECT AccountNumber, CreatedDate, name, id, phone, fax, website, type, industry, description, NumberOfEmployees, BillingCity, AnnualRevenue from account
          ORDER BY Account.Name]){
               acctList.add(new AccountWrapperCls(a));
          }
     }
    
    // SELECTING MASTER
    public List<SelectOption> getItems() 
    {
        List<Account> lstAcc = [select id, name from account ORDER BY Account.Name];
        List<SelectOption> options = new List<SelectOption>();
        
        for(Account acc : lstAcc)
        {
            options.add( new SelectOption( acc.id, acc.Name));
            options.sort();
        }
        return options;
    }
    
    
    
   public Account masterAcc = new account(name = sAccount);
    
    
     // METHODS
     public void displaySelectedAccountNumbers(){
          //selAccountNames.clear();
          //masterAcc = [Select name from Account where name = :sAccount];
          hasSelAcct = false;
          for(AccountWrapperCls cWrapper : acctList){
               if(cWrapper.isSelected){
                    hasSelAcct = true;
                    selAccountNames.add(cWrapper.cAccount.name);
                   
                   	//showMessage = true;
                   	//message = 'The following error has ocurred: \n' + cWrapper.cAccount.id;
                   	//accts.add(cWrapper.cAccount);
               }
               if(selAccountNames.size() > 1)
                {
                    for(Integer i = 1; i < selAccountNames.size(); i++)
                    {
                        showMessage = true;
                        message = 'The selected accounts are: \n' + selAccountNames;
                        acct = [Select id, name, phone FROM Account where id = :selAccountNames];
                        //acct2 = [Select id, name, phone FROM Account where id = :selAccountNames ORDER BY Account.CreatedDate];
                        
						
                        message = 'The selected query is: \n' + acct;
                        if(selAccountNames.size() > 1)
                        {
                         	try
                            {	
                                //acct.get(i).description = '\nAccount Name: ' + acct.get(0).Name;
                                Database.MergeResult[] results = Database.merge(masterAcc, acct, false);
                                
                                //merge acct.get(0) acct2.get(i); 
                                //merge acct2.get(i) master.get(1);
                                //If the first Account was created first than 2nd one then do not merge
                                /*if(acct.get(0).CreatedDate < acct.get(i).CreatedDate)
                                {
                                    acct.get(0).description = '\nAccount Name: ' + acct.get(i).Name;
                                    merge acct.get(i) acct2.get(0);     
                                }
                               else
                                {
                                    acct.get(i).description = '\nAccount Name: ' + acct.get(0).Name;
                                    merge acct.get(0) acct2.get(i); 
                                }*/
                            }
                            catch(Exception e)
                            {
                                showMessage = true;
                                message = 'The following error has founded: ' + e;
                            }
                        }
                    }
                    
                    showMessage = true;
                    message = 'Congratulations, you have merge successfully your accounts, please refresh the site to see changes. ';
                }
          }
     }
    
    public PageReference PreviousPag()
    {
        return Page.LCA;
    }    
}

Can somebody help me out with this issue?
Thanks in advace.