public static string Saerch(string searchingParams)
        {

            string searchingSymbols = searchingParams;

            List<Contact> result = new List<Contact>();

            foreach (var contact in contacts)
            {
                if (contact.Name.Contains(searchingSymbols))
                {
                    result.Add(contact);
                }
            }

            if (result.Count == 0)
            {
                throw new Exception("No contacts found");
            }

            var builder = new StringBuilder();
            if (result.Count > 0)
            {


                foreach (var contact in result)
                {
                    builder.AppendLine(contact.GetContactInfo());
                }

            }
            return builder.ToString();


        }