name-char name → char-p
name — a string designator.
char-p — a character or nil.
Returns the character object whose name is name (as determined by string-equal — i.e., lookup is not case sensitive). If such a character does not exist, nil is returned.
(name-char 'space) → #\Space (name-char "space") → #\Space (name-char "Space") → #\Space (let ((x (char-name #\a))) (or (not x) (eql (name-char x) #\a))) → true
Should signal an error of type type-error if name is not a string designator.