style: fix newline at end of StackUsingLinkedList

Author: prashantpiyush1111

src/main/java/com/thealgorithms/stacks/StackUsingLinkedList.java

@@ -67,4 +67,4 @@ public int peek() {
 	public boolean isEmpty() {
 		return top == null;
 	}
-}
+}