A 20-year-old man was stabbed several times Sunday night in John F. Kennedy Park in Cambridge, State Police say. Troopers found the man, conscious and alert, being treated by EMS personnel with multiple stab wounds. Witnesses told police a male suspect — later identified as Nicolas Baker of Guilford, Vt. — approached the victim and muttered some comments before stabbing him several times with a knife. The victim was taken to Beth Israel Deaconess Medical Center in Boston with wounds that were not considered life-threatening, State Police said. Baker, 25, was taken into custody and charged with assault and battery with a dangerous weapon and malicious destruction of property.