fix warnings

CppCoreGuidelines.md

@@ -19648,12 +19648,13 @@ To maximize the portability of `#include` directives across compilers, guidance
     // good examples
     #include <vector>
     #include <string>
-    #include "utils/utils.h"
+    #include "foo_utils/utils.h"
 
     // bad examples
     // #include <VECTOR>             // the standard library defines a header identified as <vector>, not <VECTOR>
     // #include <String>             // the standard library defines a header identified as <string>, not <String>
-    // #include "utils\utils.h"      // may not work if `\u` is interpreted as an escape sequence, or on a system where `\` is not a valid path separator
+    // #include "foo_utils\utils.h"  // may not work if `\u` is interpreted as an escape sequence, or on a system where `\` is not a valid path separator
+    // #include "Foo_Utils/Utils.H"  // the header file as it exists on the file system is "foo_utils/utils.h"
 
 ##### Enforcement