Krispy Kreme's turnaround work is slowly gaining traction.Krispy Kreme (DNUT +4.08%) is one of those rare brands that sparks instant recognition. For decades, the warm glow of its "Hot Now" sign has drawn customers eager for a taste of nostalgia. But for investors, the story has been more complicated.After years of uneven results, a failed partnership with McDonald's, and multiple attempts at reinvention, Krispy Kreme is once again trying to turn things around. The company is cutting costs, improving effici ...