Список Лекарств, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Package pack1 = new Package("Коробка", "кор.");
            Package pack2 = new Package("Флакон", "ф.");
            
            Apteca apteca = new Apteca();
            
            Drug dr1 = new Drug("Анальгин", "Analgin");
            
            var res = dr1.AddPackage(pack1);
            Console.WriteLine(res);
            
            res = dr1.AddPackage(pack2);
            Console.WriteLine(res);
            
             res = dr1.AddPackage(pack1);
            Console.WriteLine(res);            
            
            foreach(var i in dr1.Packages)
            {
                Console.WriteLine(i);
            }
            
            apteca.Packages.Add(pack1);
            apteca.Packages.Add(pack2);
            apteca.Drugs.Add(dr1);

}
    }
    
    class Package{
        
        internal string Name {get ; set;}
        internal string Symbol {get; set;}
        
        internal Package(string name, string symbol)
        {
            Name = name;
            Symbol = symbol;
        }
        
        public override string ToString(){
            return string.Format("{0} - {1}", Name, Symbol);
        }
    }
    
    class Drug{
        
        internal string Name {get;set;}
        internal string LatinName {get; set;}
        
        internal List<Package> Packages {get; set;}
        
        internal Drug(string name, string latinName)
        {
            Name = name;
            LatinName = latinName;
            Packages = new List<Package>();
        }
        
        internal bool AddPackage(Package pack)
        {
            if(!Packages.Contains(pack)){
                Packages.Add(pack);
                return true;
            }
            else{
                return false;
            }            
        }
        
        public override string ToString(){
            return string.Format("{1} - {0}", Name, LatinName);
        }
    }
        
    class Apteca{
        
        internal List<Drug> Drugs {get; set;}
        internal List<Package> Packages {get; set;}
        
        internal Apteca()
        {
            Drugs = new List<Drug>();
            Packages = new List<Package>();
        }
    }
            
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 14 Mb, average nr of threads: 3