Преобразование между символом и строкой

(coerce "a" 'character)
; #\a
(coerce (subseq "cool" 2 3) 'character)
; #\o
(coerce "cool" 'list)
; (#\c #\o #\o #\l)
(coerce '(#\h #\e #\y) 'string)
; "hey"
(coerce (nth 2 '(#\h #\e #\y)) 'character)
; #\y
(defparameter *my-array* (make-array 5 :initial-element #\x))
; *MY-ARRAY*
*my-array*
; #(#\x #\x #\x #\x #\x)
(coerce *my-array* 'string)
; "xxxxx"
(string 'howdy)
; "HOWDY"
(string #\y)
; "y"
(coerce #\y 'string)
; #\y can't be converted to type STRING.
; [Condition of type SIMPLE-TYPE-ERROR]