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what is wrong in my elisp

what is wrong in my elisp

I evaluate

(defun indentTabs()
  ( ;  save-excursion ; cf restores point to its original position
    (   message "coucou"   )
    (goto-char (point-min))
 (   message "coucou2"   )
(let  ((cpt 100))    ;double parenthese obligee
    (while (> cpt 0)
    (c-indent-command 0);   widget-forward            ;TAB    
      ( move-beginning-of-line 0)
     (  next-line 1)
    (setq cpt   (1- cpt)) ;  (1- cpt))
; ( message "cpt=%d"( 3 )  );!! parentheses autour cpt
       (   message "fin partielle"   )        
          )) )  ) )

with C-x C-e so that indentTabs is integrated as a command, but when in a yacc file.y, I do:M-x indentTabs  ; it says invalid function: (message "coucou")
What is wrong? though I write similar as  : (message "This message appears in the echo area!")  ?

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