Mark Hamill should have felt mighty embarrassed with CORVETTE SUMMER! This time, he uses a new kind of "force" to regain the possession of his dream machine, a bright red 'Vette. It looks like another sour teen-age flick the first half-hour and does a U-turn in heading for the wrong direction. The writing and directing jobs are dreadfully done, with a few scenes you can't hardly "1"  )  )   )  and  ( 7396 = 6351 ) *6351 and   (  (   ( "xerw" like "xerw