diff --git a/age.c b/age.c
deleted file mode 100644
index 3100b82..0000000
--- a/age.c
+++ /dev/null
@@ -1,11 +0,0 @@
-#include "age.h"
-
-void setAge(uint8_t age)
-{
-	g_age = age;
-}
-uint8_t getAge(void)
-{
-	g_age = g_age+1;
-	return g_age+2;
-}
\ No newline at end of file
diff --git a/classroom/classroom.c b/classroom/classroom.c
new file mode 100644
index 0000000..0b42044
--- /dev/null
+++ b/classroom/classroom.c
@@ -0,0 +1,6 @@
+#include "classroom.h"
+uint16_t remain_classroom;
+void cs_check_remain_classroom(void)
+{
+	return remain_classroom;
+}
\ No newline at end of file
diff --git a/classroom/classroom.h b/classroom/classroom.h
new file mode 100644
index 0000000..77a473e
--- /dev/null
+++ b/classroom/classroom.h
@@ -0,0 +1,6 @@
+#ifndef CLASSROOM_H
+#define CLASSROOM_H
+
+void cs_check_remain_classroom(void);
+void cs_book_classroom(uint16_t classroom);
+#endif
\ No newline at end of file
diff --git a/fun.c b/fun.c
deleted file mode 100644
index aa7a2f0..0000000
--- a/fun.c
+++ /dev/null
@@ -1 +0,0 @@
-#include "fun.h"
\ No newline at end of file