Data commit

Task/Palindrome-detection/ACL2/palindrome-detection.acl2

@@ -0,0 +1,17 @@
+(defun reverse-split-at-r (xs i ys)
+  (if (zp i)
+      (mv xs ys)
+      (reverse-split-at-r (rest xs) (1- i)
+                          (cons (first xs) ys))))
+
+(defun reverse-split-at (xs i)
+  (reverse-split-at-r xs i nil))
+
+(defun is-palindrome (str)
+  (let* ((lngth (length str))
+         (idx (floor lngth 2)))
+    (mv-let (xs ys)
+            (reverse-split-at (coerce str 'list) idx)
+            (if (= (mod lngth 2) 1)
+                (equal (rest xs) ys)
+                (equal xs ys)))))