private IQueryable <LibraryItem> GetTitleAndTitleAcronym(IQueryable <LibraryItem> libraryItems)
        {
            string Convert(IEnumerable <char> s) => new string(s.ToArray());

            foreach (LibraryItem Titles in libraryItems)
            {
                string AcronymedTitel = Convert(Titles.Title.Where((c, i) => !char.IsWhiteSpace(c) && (i == 0 || char.IsWhiteSpace(Titles.Title[i - 1]))));
                Titles.SetAcronymedTitle(Titles.Title, AcronymedTitel.ToUpper());
            }

            return(libraryItems);
        }