How to search for an atom in another atom

From: Christian Soltenborn (no_spam_csoltenborn_at_webmail.de)
Date: 01/25/04 

Date: Sun, 25 Jan 2004 16:53:32 -0600

Hi folks,

I just started to learn Lisp, and I have a small question: I have to
write a function which checks if an atom is contained in another atom.
For example:

>(setf expr 'xyz)
XYZ
> (checkp 'x expr)
T
>(checkp 'a expr)
NIL

Unfortunately I have no clue how I can access the single "chars" of an
atom. And it is kind of hard to find this information if you don't know
for which function to search. Could somebody give me a hint?

Thanks in advance,
Christian

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