refactor: refactor old IOHelper.

- move pointer left padding macro into single header file.
- move utf8 fopen into single header but not finished.
- add testbench for pointer left padding macro.
- add system pointer size detector according to new migrated features requested.

src/yycc/patch/ptr_pad.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include "../macro/ptr_size_detector.hpp"
+#include <cstdint>
+
+/**
+ * @def PRIXPTR_LPAD
+ * @brief The left-padding zero format string of HEX-printed pointer type.
+ * @details
+ * When printing a pointer with HEX style, we usually hope it can be left-padded with some zero for easy reading.
+ * In different architecture, the size of this padding is differnet too so we create this macro.
+ *
+ * In 32-bit environment, it will be "08" meaning left pad zero until 8 number position.
+ * In 64-bit environment, it will be "016" meaning left pad zero until 16 number position.
+*/
+
+#if defined(YYCC_PTRSIZE_32)
+#define PRIXPTR_LPAD "08"
+#else
+#define PRIXPTR_LPAD "016"
+#endif