King Charles gave an update on his cancer treatment amid easter celebrations on Sunday, March 31. While doing a surprise walkabout following services at St George’s Chapel, the monarch — who revealed he was diagnosed with cancer in February — was urged to “keep going strong,” to which he joked, “I’m doing my best.” The 75-year-old made his most significant appearance since his treatment began by Windsor Castle alongside Queen consort Camilla Parker Bowles. The king smiled wide and happily waved at the small crowd of spectators while wearing a navy coat, white shirt and blue tie for the occasio…