public List <Pen> ListsPens()
        {
            var useCasePens = PenCollectorInteractor.ListsPens();
            var pens        = new List <Pen>();

            foreach (var useCaseInk in useCasePens)
            {
                pens.Add(UseCaseDtoToDtoConverter.Convert(useCaseInk));
            }
            return(pens);
        }
        public List <Ink> ListsInks()
        {
            var useCaseInks = PenCollectorInteractor.ListsInks();
            var inks        = new List <Ink>();

            foreach (var useCaseInk in useCaseInks)
            {
                inks.Add(UseCaseDtoToDtoConverter.Convert(useCaseInk));
            }
            return(inks);
        }