private static List <BingoCard> ParseCards(IEnumerable <string> game)
{
var lines = new List <string>();
var cards = new List <BingoCard>();
foreach (string line in game.Skip(2))
{
if (string.IsNullOrEmpty(line))
{
cards.Add(BingoCard.Create(lines));
lines.Clear();
continue;
}
lines.Add(line);
}
cards.Add(BingoCard.Create(lines));
return(cards);
}