code_clean: restrict 'use_function_style_cast' edits to C++

Allows running multiple edits at once on C & C++ files without
C++ edits being attempted on C source.

tools/utils_maintenance/code_clean.py

@@ -1081,12 +1081,16 @@ class edit_generators:
           float(foo(a + b))
         """
         @staticmethod
-        def edit_list_from_file(_source: str, data: str, _shared_edit_data: Any) -> List[Edit]:
+        def edit_list_from_file(source: str, data: str, _shared_edit_data: Any) -> List[Edit]:
+
+            edits: List[Edit] = []
+
+            # The user might include C & C++, if they forget, it is better not to operate on C.
+            if source.lower().endswith((".h", ".c")):
+                return edits
 
             any_number_re = "(" + "|".join(BUILT_IN_NUMERIC_TYPES) + ")"
 
-            edits = []
-
             # Handle both:
             # - Simple case:  `(float)(a + b)` -> `float(a + b)`.
             # - Complex Case: `(float)foo(a + b) + c` -> `float(foo(a + b)) + c`