[dedupe] Jaccard similarity

src/jaccard.h

@@ -0,0 +1,11 @@
+#ifndef JACCARD_H
+#define JACCARD_H
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "collections.h"
+
+double jaccard_similarity(khash_t(str_set) *s1, khash_t(str_set) *s2);
+
+#endif