Add Rotate a Linkedlist (#4345)

src/main/java/com/thealgorithms/datastructures/lists/RotateSinglyLinkedLists.java

@@ -0,0 +1,33 @@
+package com.thealgorithms.datastructures.lists;
+
+/**
+ * Rotate a list
+ * @author Bama Charan Chhandogi (https://github.com/BamaCharanChhandogi)
+ */
+
+public class RotateSinglyLinkedLists {
+    public Node rotateRight(Node head, int k) {
+        if (head == null || head.next == null || k == 0) {
+            return head;
+        }
+
+        Node curr = head;
+        int len = 1;
+        while (curr.next != null) {
+            curr = curr.next;
+            len++;
+        }
+
+        curr.next = head;
+        k = k % len;
+        k = len - k;
+        while (k > 0) {
+            curr = curr.next;
+            k--;
+        }
+
+        head = curr.next;
+        curr.next = null;
+        return head;
+    }
+}