BUFFALO, N.Y. (AP) — The Buffalo Sabres’ long-anticipated offseason retooling began late Wednesday night with the team agreeing to trade forward JJ Peterka to the Utah Mammoth for forward Josh Doan and defenseman Michael Kesselring. Both teams announced the deal with Utah revealing it signed Peterka to a five-year contract worth $38.5 million. Peterka completed his rookie contract this season, and was eligible to become a restricted free agent next week. “There is a lot of excitement and positive momentum surrounding our team right now, and adding a player of J.J. Peterka’s caliber and offensive upside is another great step towards achieving our objectives as a group,” Mammoth president of hockey operations Chris Armstrong said. This is a major swap of young players all within their first three full seasons of NHL experience. The 23-year-old Peterka is coming off consecutive 25-plus goal seasons, including 27 this year with a career-best 68 points in 77 games. Doan, a 23-year-old winger, is the son of longtime Arizona Coyotes star Shane Doan, and his departure is the organization’s latest move that separates this Salt Lake City chapter from the past. He had seven goals and 19 points last season as a rookie. Kesselring, a