remove cpp header guard (once)

remove-gaurd.el

(defun remove-line()
  (delete-region
   (progn (forward-visible-line 0) (point))
   (progn (forward-visible-line 1) (point))))

(defun remove-guard()
  (interactive)
  (progn
    (goto-char (point-min))
    (search-forward-regexp "^#ifndef")
    (remove-line)
    (goto-char (point-min))
    (search-forward-regexp "^#define")
    (remove-line )
    (goto-char (point-max))
    (search-backward-regexp "^#endif")
    (remove-line)))