Improve doxygen header snippet

UltiSnips/c_doxygen.snippets

@@ -31,13 +31,21 @@ snippet "/// a" "Doxygen attention block"
 /// @attention $0
 endsnippet
 
-snippet file "Doxygen file block" b
+snippet header "Header noise" b
+$1
 /// @file
 ///
-/// @brief $0
+/// @brief $2
 ///
 /// @copyright
-/// Copyright (C) 2002-2016 Codeplay Software Limited. All Rights Reserved.
+/$1
+#ifndef ${4/([A-Za-z_]){1}([A-Za-z0-9_]+).*/$1$2/}$3
+#define $4${3:`!p import string
+snip.rv = re.sub(r'[^A-Za-z0-9]+','_', snip.fn).upper()`_INCLUDED}
+
+$0
+
+#endif  // ${4/([A-Za-z_]){1}([A-Za-z0-9_]+).*/$1$2/}$3
 endsnippet
 
 snippet "/// cp" "Doxygen copydoc block"