Added lazy repeater solution.

README.md

@@ -30,6 +30,7 @@ other languages.
 - Fibonacci Product (https://www.codewars.com/kata/5541f58a944b85ce6d00006a)
 - Valid Parentheses (https://www.codewars.com/kata/52774a314c2333f0a7000688)
 - Alphanumeric (https://www.codewars.com/kata/526dbd6c8c0eb53254000110)
+- Lazy Repeater (https://www.codewars.com/kata/51fc3beb41ecc97ee20000c3)
 
 #### Kata 6
 

src/codewars/lazy_repeater.rs

@@ -0,0 +1,18 @@
+fn make_looper(s: &str) -> impl FnMut() -> char + '_ {
+    let mut char_looper = s.chars().cycle();
+    move || char_looper.next().unwrap()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::make_looper;
+
+    #[test]
+    fn test_looper_correctly_loops_over_given_characters() {
+        let mut looper = make_looper("abc");
+        assert_eq!('a', looper());
+        assert_eq!('b', looper());
+        assert_eq!('c', looper());
+        assert_eq!('a', looper());
+    }
+}

src/codewars/mod.rs

@@ -47,3 +47,4 @@ mod summation;
 mod sumpairs;
 mod valid_parentheses;
 mod valid_spacing;
+mod lazy_repeater;