[Vekz]

This is what I have, it def could be improved:

  (defun capture-comment-line (&optional line)
    (let ((c
          (save-excursion
            (save-window-excursion
              (switch-to-buffer (plist-get org-capture-plist :original-buffer))
            comment-start)
            )))
      (while (string-prefix-p c line)
        (setq line (string-remove-prefix c line)))
      (comment-string-strip line t t)
      ))

  (setq org-capture-templates
        '(("C" "TODO code comment" entry (file+headline "~/org/brain/code.org" "Tasks")
          "\* %(capture-comment-line \"%i\")\n  %a"
          )))

[wanderingmind]

Thank you very much