Simplify my/kill-this-buffer in Emacs

kill-buffer non-interactively without an argument acts on the current buffer.

content/emacs-configuration.org

@@ -565,12 +565,12 @@ Change the default keybinding for killing a buffer, ~C-x k~, so that it kills th
 Also binds ~C-x M-k~ to bury the current buffer, a command that's not bound to any key by default.
 
 #+begin_src emacs-lisp
-(defun my/kill-this-buffer ()
-  "Kill current buffer, prompting if there are unsaved changes."
-  (interactive)
-  (kill-buffer (current-buffer)))
-
-(global-set-key (kbd "C-x k") #'my/kill-this-buffer)
+(global-set-key
+ (kbd "C-x k")
+ (defun my/kill-this-buffer ()
+   "Kill current buffer, prompting if there are unsaved changes."
+   (interactive)
+   (kill-buffer)))
 (global-set-key (kbd "C-x K") #'kill-buffer)
 (global-set-key (kbd "C-x M-k") #'bury-buffer)
 #+end_src