Hollie Adams/Pool/ReutersKing Charles is to return to “public-facing duties” next week, Buckingham Palace said Friday, in an encouraging sign that his cancer treatment is working.One of his first engagements will be to visit a cancer treatment center with Queen Camilla on Tuesday, and in June he will host the Emperor and Empress of Japan for a state visit. Hopes will be high that he will now be cleared by doctors to attend the Trooping the Color ceremony which celebrates the monarch’s official b