GameStop and AMC slumped on Wednesday as the “meme stock rally” driven by the surprise return of “Roaring Kitty” showed signs of fizzling out.Shares of GameStop were down by 31%, to $32.40 per share, after posting sizable gains in each of the previous two trading sessions. AMC sank about 25% to $5.10 per share. 4 Roaring Kitty’s real name is Keith Gill.The two firms had gained more than $11 billion combined in market value since the start of the week.Even the comeback of Roaring Kitty – the retail invest ...