emacs - Elisp: simple function to split window and move cursor to new window -

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I find it dumb in posting but I do not know why this function does not commensurate: 

  (defun dc / split-window-below-and-move-cursor () (interactive) (split-window-bottom) (other window 1))

Do I overlook something super clear?

There is an error message here: 

  The function definition of the symbol is zero: partition-window-bottom

Tried the second file (on a fresh Macs session) and it worked fine. (Bypassing progn and entering it in (interactive) did not fix it - I have updated the above code to show this change.)

Update 2: OK, it's just silly the following code works fine but I still can not get the defun code above to work. If someone thinks, then still it will be very eager to understand. 

  (global set-key (kbd "----") (lambda (interactive) (partition) -window-bottom) (other window 1)))   
 
 
  progn , but you  interactive : 
 
  is required (defun dc / split-window-below-and-le-cursor () (interactive) (partition-window-bottom) (Other Window 1))

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