Rebinding “C-d” in Emacs

(require 'cl)
(require 'package)

(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/") t)
(when (< emacs-major-version 24)
  (add-to-list 'package-archives '("gnu" . "http://elpa.gnu.org/packages/"))) ;; For important compatibility libraries like cl-lib
(package-initialize)


;; use-package
(setq package-enable-at-startup nil)
(unless (package-installed-p 'use-package)
  (package-refresh-contents)
  (package-install 'use-package))
(require 'use-package)

(use-package smartparens
  :ensure t
  ;:defer t
  :diminish smartparens-mode
  :config
  (progn
    (require 'smartparens-config)
    (smartparens-global-mode 1)
    (show-paren-mode 1)))


(fset 'buf-move-up "\C-u10\C-p")
(fset 'buf-move-down "\C-u10\C-n")

(global-set-key (kbd "M-U") 'buf-move-up)
(global-set-key (kbd "M-D") 'buf-move-down)

(global-set-key (kbd "C-d") 'sp-kill-sexp)