Run utils/trim-trailing-whitespace.py on codebase

examples/tutorial/third.cc

@@ -39,7 +39,7 @@ using namespace ns3;
 
 NS_LOG_COMPONENT_DEFINE ("ThirdScriptExample");
 
-int 
+int
 main (int argc, char *argv[])
 {
   bool verbose = true;
@@ -162,7 +162,7 @@ main (int argc, char *argv[])
   echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
   echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
 
-  ApplicationContainer clientApps = 
+  ApplicationContainer clientApps =
     echoClient.Install (wifiStaNodes.Get (nWifi - 1));
   clientApps.Start (Seconds (2.0));
   clientApps.Stop (Seconds (10.0));