Starting any Emacs buffer with a .c extension with a template

#include <stdio.h>
#include <stdlib.h>

int main(void){

}

(define-skeleton c-throwaway
  "Throwaway C skeleton"
  "#include <stdio.h>n"
  "#include <stdlib.h>n"
  "n"
  "int main(void){n"
  "n"
  "}n")

(define-auto-insert "\.\([Cc]\|cc\|cpp\)\'" 'c-throwaway)

(defun defaultCtemplate(cfilename)
    (interactive "sFilename: ")
    (switch-to-buffer (generate-new-buffer cfilename))
    (insert-file-contents "~/Desktop/test.c")
    (c-mode)
)

(require 'tempo)

(setq c-new-buffer-template
      '(
        "#include <stdio.h>n"
        "#include <stdlib.h>n"
        "n"
        "int main(void){n"
        "n"
        "}n"
        ))

(defun my-c-style ()
  "My editing style for .c files."
  (c-mode)
  (if (zerop (buffer-size))
      (tempo-template-c-skeleton)))

(setq auto-mode-alist
      (cons '("\.c\'" . my-c-style) auto-mode-alist))

(tempo-define-template "c-skeleton" c-new-buffer-template
    	       nil
    	       "Insert a skeleton for a .c document")