Adding implementation for profoundMathStatment method required for im…

…plementing MathStatement interface into ExtremeSubtraction class

src/main/java/org/apache/commons/lang3/math/ExtremeSubtraction.java

@@ -1,6 +1,6 @@
 package org.apache.commons.lang3.math;
 
-public class ExtremeSubtraction {
+public class ExtremeSubtraction implements MathStatement{
 
 	private int x;
 	private int y;
@@ -13,4 +13,9 @@ public ExtremeSubtraction(int x, int y) {
 	public int extremeSubtract() {
 		return this.x - this.y;
 	}
+
+	@Override
+	public String profoundMathStatement() {
+		return "2 - 2 is also 4 as well!? No just kidding. It's 0";
+	}
 }