>
> (defn substring? [str1 str2]
>  (let [c1 (count str1)
>       c2 (count str2)]
>  (and (<= c1 c2)
>       (or (= str1 (subs str2 0 c1))
>          (substring? str1
>                      (subs str2 1 c2))))))

This should be a little faster:

(defn substring? [#^String s1 #^String s2]
   (not (= -1 (.indexOf s2 s1))))

user=> (substring? "foo" "foobar")
true
user=> (substring? "bar" "Baz")
false


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