file extensions changed - ns-3 sometimes doesn't build *.c files

diff --git a/model/ndnabstraction-header.cc b/model/ndnabstraction-header.cc
new file mode 100644
index 0000000..9b0eecb
--- /dev/null
+++ b/model/ndnabstraction-header.cc
@@ -0,0 +1,11 @@
+/*
+ *  ndnabstraction-header.c
+ *  XcodeProject
+ *
+ *  Created by Ilya Moiseenko on 7/18/11.
+ *  Copyright 2011 University of California, Los Angeles. All rights reserved.
+ *
+ */
+
+#include "ndnabstraction-header.h"
+#include "ns3/assert.h"
\ No newline at end of file