Fix VM memory allocation optimizations by reducing what we allocate on the heap

internal/builtins/input.go

@@ -20,7 +20,7 @@ func Input(args ...object.Object) object.Object {
 	}
 
 	if len(args) == 1 {
-		prompt := args[0].(*object.String).Value
+		prompt := args[0].(object.String).Value
 		fmt.Fprintf(os.Stdout, prompt)
 	}
 
@@ -30,5 +30,5 @@ func Input(args ...object.Object) object.Object {
 	if err != nil && err != io.EOF {
 		return newError(fmt.Sprintf("error reading input from stdin: %s", err))
 	}
-	return &object.String{Value: string(line)}
+	return object.String{Value: string(line)}
 }