Add assymetric test to string reverse (#330)

Author: sn-chr

src/string/reverse.rs

@@ -11,6 +11,11 @@ mod tests {
         assert_eq!(reverse("racecar"), "racecar");
     }
 
+    #[test]
+    fn test_assymetric() {
+        assert_eq!(reverse("abcdef"), "fedcba")
+    }
+
     #[test]
     fn test_sentence() {
         assert_eq!(reverse("step on no pets"), "step on no pets");