Added max repeating substring solution.

README.md

@@ -118,6 +118,7 @@ other languages.
 - X of a kind in a deck of cards (https://leetcode.com/problems/x-of-a-kind-in-a-deck-of-cards/)
 - Remove From Sorted Array (https://leetcode.com/problems/remove-duplicates-from-sorted-array/)
 - Sort the People (https://leetcode.com/problems/sort-the-people)
+- Max Repeating Substring (https://leetcode.com/problems/maximum-repeating-substring/)
 
 #### Medium
 

src/leetcode/max_repeating_substr.rs

@@ -0,0 +1,22 @@
+pub fn max_repeating(sequence: String, word: String) -> i32 {
+    let mut sub_str = "".to_string();
+    while sequence.contains(&sub_str) {
+        sub_str.push_str(&word)
+    }
+    let result = (sub_str.len() - word.len()) / word.len();
+    result as i32
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn find_max_repeating() {
+        let actual = max_repeating("ababc".to_string(), "ab".to_string());
+        assert_eq!(2, actual);
+
+        let actual = max_repeating("ababc".to_string(), "abcd".to_string());
+        assert_eq!(0, actual)
+    }
+}

src/leetcode/mod.rs

@@ -46,3 +46,4 @@ mod intersection_two;
 mod x_kind;
 mod remove_duplicates;
 mod sort_people;
+mod max_repeating_substr;