printf("Hello world");

Lisp mode, move left parenthesis, remove semicolon

    (printf "Hello world")

Second round

    if (var == 2) {
      do_something1 ();
    } else {
      do_something2 ();
    }

Lisp mode, move left parenthesis, remove semicolon and curly brackets

    (if (= var 2)
        (do_something1)
        (do_something2)
    )

On a big source file I am not sure if the amount of parenthesis is bigger than parenthesis , bracket, curly brackets and semicolons counted together.