Add method to set seed

Signed-off-by: Rahul Rudragoudar <rr83019@gmail.com>

src/main/java/lc/misc/HelperFunctions.java

@@ -9,6 +9,10 @@ public class HelperFunctions {
 
   private static Random random = new Random(seed);
 
+  synchronized public static void setSeed(long seed){
+    random.setSeed(seed);
+  } 
+
   public static void setRenderingHints(Graphics2D g2d) {
     g2d.setRenderingHint(
         RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);