backport: optimize documents

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 源文雨
+Copyright (c) 2020-2024 源文雨
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

base16384.c

@@ -1,5 +1,11 @@
-//base16384.c
-//MIT fumiama 20200416
+/* base16384.c
+ * This file is part of the base16384 distribution (https://github.com/fumiama/base16384).
+ * Copyright (c) 2020-2024 Fumiama Minamoto.
+ *
+ * This program is distributed in MIT license.
+ * Initially created at 20200416.
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include "bitio.h"

bitio.c

@@ -1,3 +1,11 @@
+/* bitio.c
+ * This file is part of the base16384 distribution (https://github.com/fumiama/base16384).
+ * Copyright (c) 2020-2024 Fumiama Minamoto.
+ *
+ * This program is distributed in MIT license.
+ * Initially created at 20200416.
+ */
+
 #include "bitio.h"
 
 int pushbit(BIT *buffer, const int isture){

bitio.h

@@ -1,8 +1,14 @@
 #ifndef _BITIO_H_
 #define _BITIO_H_
-//bitio.h
-//made by fumiama
-//20200413
+
+/* bitio.h
+ * This file is part of the base16384 distribution (https://github.com/fumiama/base16384).
+ * Copyright (c) 2020-2024 Fumiama Minamoto.
+ *
+ * This program is distributed in MIT license.
+ * Initially created at 20200413.
+ */
+
 #include <stdio.h>
 #include <string.h>
 #ifndef BITBUFSIZE