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.