     use GenServer
     @moduledoc """
     The callee need to be registered to the WAMP Dealer in order to be accesseble and expose
-    the procedure. 
-    
+    the procedure.
+
     iex> Callee.start_link()
 
-    Once it is registered it will wait an invocation from the Dealer and yield 
+    Once it is registered it will wait an invocation from the Dealer and yield
     the result back. in this case we have two function exposed:
 
     - `spell.math.sum`

:timer.sleep(10000)

Logger.info("DONE... Stopping Crossbar.io server")
# Stop the crossbar.io testing server
:ok = Crossbar.stop()


# This example want to show how to call a Remote Procedure.
# Inside the module RPC we have the module Callee where the procedure
# is defined and the module Calleer who will call the procedure.
#
# Run this script from the Spell root with
