Teenagers Eileen Gu and Kamila Valieva became faces of the Beijing Winter Olympics that ended on Sunday for very different reasons. The 18-year-old California-born Gu delighted hosts China with two golds and one silver in freestyle skiing and as a social media hit, building some bridges between the two countries which have a strained political relationship. Russian Valieva, 15, stunned as the first woman to stand a quad jump at the Games en route to first place in the team event but the news of a positive doping test in December then turned her world upside down and she finished fourth in the …