change newline to null then newline

Week8/Assignment8/src/partB/Replace.java

@@ -12,7 +12,7 @@ public class Replace {
 	
 	public static void printArray(int[] a) {
 		if(a==null) {
-			System.out.println(); //Create a newline to make the format looks uniform
+			System.out.println("null"); //Print the string null
 			return; //If a is a null pointer, return immediately to prevent a NullPointerException
 		}
 		//NOTE: return; (a return statement without a return value) in a method with no return type will break out of the method.