Record Formula 1 world champion Lewis Hamilton’s switch to Ferrari next year has forced Scuderia team boss Frederic Vasseur to make two difficult phone calls. One was with his current driver Carlos Sainz, who will have to make way for Hamilton in 2025. And one with Mercedes team boss Toto Wolff, who will have to plan without his Formula 1 superstar next year. “As you can imagine, it was not the easiest call of my life, but the one that was most difficult was the one with Toto,” said Vasseur at the presentation of the new car, named SF-24, when asked how he had broken the bad news to Sainz. Ham…