full name and signature improvements

Signed-off-by: Prabhu Subramanian <prabhu@appthreat.com>

Author: prabhu

platform/frontends/c2cpg/src/main/scala/io/appthreat/c2cpg/parser/FileDefaults.scala

@@ -9,11 +9,12 @@ object FileDefaults:
   private val C_HEADER_EXT     = ".h"
   private val CPP_HEADER_EXT   = ".hpp"
   private val OTHER_HEADER_EXT = ".hh"
+  private val PREPROCESSED_EXT = ".i"
 
   val SOURCE_FILE_EXTENSIONS: Set[String] = Set(C_EXT, CC_EXT, CPP_EXT)
 
   val HEADER_FILE_EXTENSIONS: Set[String] =
-      Set(C_HEADER_EXT, CPP_HEADER_EXT, OTHER_HEADER_EXT, ".h.in", ".tmh")
+      Set(C_HEADER_EXT, CPP_HEADER_EXT, OTHER_HEADER_EXT, PREPROCESSED_EXT, ".h.in", ".tmh")
 
   private val CPP_FILE_EXTENSIONS = Set(CC_EXT, CPP_EXT, CPP_HEADER_EXT, ".ccm", ".cxxm", ".c++m")