Fix for Issue TheAlgorithms#771. position=size causes NPE

Author: abhijay94

DataStructures/Lists/SinglyLinkedList.java

@@ -66,13 +66,12 @@ public void deleteHead() {
     }
 
     /**
-    * This method deletes an element at Nth position
-    */
+     * This method deletes an element at Nth position
+     */
     public void deleteNth(int position) {
-         if (position < 0 || position > getSize()) {
+        if (position < 0 || position >= getSize()) {
             throw new RuntimeException("position less than zero or position more than the count of list");
-        }
-        else if (position == 0)
+        } else if (position == 0)
             deleteHead();
         else {
             Node cur = head;