fix bug in example with uncaught null at the end of msg

Author: stevenqie

examples/ccs/ccs_server.py

@@ -2,7 +2,9 @@
 
 def handler(msg):
     print("CCS Ping handler called on " + str(charm.myPe()))
-    answer = "Hello to sender " + str(msg) + "from PE " + str(charm.myPe())
+
+    msg = msg.rstrip('\x00') #removes null characters from the end
+    answer = "Hello to sender " + str(msg) + " from PE " + str(charm.myPe()) + ".\n"
     # send the answer back to the client
     charm.CcsSendReply(answer)