I've only been able to get 72% code coverage for my apex class. I'm new to apex development. Can someone help me please?

Here is my class:

public class PcPContactInfo {
    public Precall_Plan_2__c c{get; set;}
   
    public PcPContactInfo(ApexPages.StandardController controller)
        {
             c = (Precall_Plan_2__c)controller.getRecord();
        }
   
    public pagereference logout()
        {  
             pagereference p1=new pagereference('/apex/Precall_Plan_Detail_clone?id='+c.get('Id')+'&clone=1');
             return p1;
        }
   
   
    public PageReference dosave()
        {   
             try
            {
                 if(ApexPages.currentPage().getParameters().get('clone')=='1'||ApexPages.currentPage().getParameters().get('save_new')=='1')
                    {
                        c.id=null;                   
                        insert c;
                    }
               
                 else
                        update c;
            }
       
                 catch(exception e) { ApexPages.addMessages(e); return null;  } 

                 return new Pagereference('/' + c.get('Id'));
        }
    
    public void doSomething()
        {
           contact TEST = [SELECT account.name,MailingCountry,Mailingcity,Title,Phone,MailingStreet,MailingState,MailingPostalCode, accountid FROM contact where id = :c.Contact_name2__c];
           // c.Company_Name__c= TEST.account.name;
           c.Contact_mailing_city__c=TEST.Mailingcity;
           c.Contact_s_Title__c=TEST.Title;
           c.Contact_s_Telephone_Number__c=TEST.Phone;
           c.Contact_Street__c=TEST.MailingStreet;
           c.Contact_State__c=TEST.MailingState;
           c.Contact_Zip__c=TEST.MailingPostalCode;
     
        }
}

And here is my Test Class:

@isTest
private class test_PcPContactInfo
{

    static testMethod void go_PcPContactInfo() 
    {
   
        account a = new account(name='ESAB');
        insert a;
        contact c = new contact (lastname= 'test2',accountid=a.id,email='abc@gmail.com');
        insert c;
       
        Precall_Plan_2__c  cw=new Precall_Plan_2__c(name='test',Contact_name2__c=c.id,Company_Name__c=a.id);
        insert cw;
       
        ApexPages.StandardController controller = new ApexPages.StandardController(cw);
        PcPContactInfo stdController = new PcPContactInfo(controller);
        //account a = [SELECT name,id FROM account limit 1];
       
        //contact TEST = [SELECT id, accountid,email FROM contact where id = :cw.contact__c];
        //cw.Email__c = TEST.email;
        //update cw;
       
        stdController.doSomething();
        stdController.dosave();
       
       
    }
}