Function extension

src/core/filesystem/path.cpp:85–91

	}

	const char *extension(const char *path)
	{
		CE_ENSURE(NULL != path);
		const char *bn = basename(path);
		const char *ld = strrchr(bn, '.');
		return (ld == NULL || ld == bn) ? NULL : ld + 1;
	}

	bool has_trailing_separator(const char *path)
	{