public string RegisterHarvester(List <string> args)
 {
     try
     {
         Harvester harvester = HarvesterFactory.ProduceHarvester(args);
         harvesters.Add(harvester);
         return($"Successfully registered {args[0]} Harvester - {harvester.Id}");
     }
     catch (ArgumentException ex)
     {
         return(ex.Message);
     }
 }