public Football GetFootball(string id)
 {
     try
     {
         Football football = this.footballs[id];
         return(football);
     }
     catch (KeyNotFoundException e)
     {
         throw new FootballNotFoundException();
     }
 }
        public Football AddAutograph(string id, string autograph)
        {
            try
            {
                Football football = this.footballs[id];
                if (football.Autographs.Count >= 32)
                {
                    throw new FootballFullException();
                }

                football.addAutograph(autograph);
                return(football);
            } catch (KeyNotFoundException e)
            {
                throw new FootballNotFoundException();
            }
        }