title: How to edit a function signature at the same time
body: <p>I'm using VScode as my IDE, IN my college we require to write our codes using TopDown Design.
  like this example:</p>
  
  <pre><code>void sum(int a, int b);
  int main()
  {
      int a=2, int b=3;
      sum(a,b);
      return 0;
  }
  void sum(int a, int b)
  {
      printf("%d", a+b);
  }
  </code></pre>
  
  <p>My problem is that a lot of time while editing my function at the "Down LVL" I also need to edit the signature for adding or removing arguments, is there add-in or some key bind in VScode that can edit both signatures at the same time while I only edit one of them?
  <a href="https://i.stack.imgur.com/tALIJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tALIJ.png" alt="my problem"></a></p>