Declare a string in elisp and then inserting it in emacs lisp

Question

I want to create i string and then insert it, but i get the error wrong argument char-or-stringp. What does it mean?

(defun test ()

   (string "1 2 3")
 )


(insert (test))

Answer 1

Your string call is incorrect. "1 2 3" is already a string. You seem to be looking for simply

(insert "1 2 3")

or if you want to demonstrate a function call,

(defun test ()
  "1 2 3")

(insert (test))

The string form expects a sequence of characters, like this:

(string ?1 ? ?2 ? ?3)
=> "1 2 3"