diff --git a/Makefile b/Makefile
index fae0308..2644b81 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 # License       : GPLv3
 # Authors       : Aoran Zeng <ccmywish@qq.com>
 # Created on    : <2023-08-28>
-# Last modified : <2023-09-20>
+# Last modified : <2024-05-24>
 # ---------------------------------------------------------------
 
 CFLAGS = # -Wall
@@ -37,12 +37,12 @@ test: $(TARGET)
 	./$(TARGET) get  ruby
 	./$(TARGET) get  python
 
-.PHONY: xy
-xy:
-	@$(CC) test_xy.c -o xy
-	@./xy
+test_xy:
+	@mkdir -p build
+	@$(CC) test/xy.c -o build/xy
+	@./build/xy
 
 clean:
 	-@rm *.exe      2>/dev/null
 	-@rm $(TARGET)  2>/dev/null
-	-@rm ./xy	  		2>/dev/null
+	-@rm ./build/* 2>/dev/null
diff --git a/test_xy.c b/test/xy.c
similarity index 97%
rename from test_xy.c
rename to test/xy.c
index 85056a7..63c3516 100644
--- a/test_xy.c
+++ b/test/xy.c
@@ -1,16 +1,16 @@
 /** ------------------------------------------------------------
- * File          : test_xy.c
+ * File          : xy.c
  * License       : MIT
  * Authors       : Aoran Zeng <ccmywish@qq.com>
  * Created on    : <2023-08-30>
- * Last modified : <2024-04-18>
+ * Last modified : <2024-05-24>
  *
  * test_xy:
  *
  *   测试 xy.h
  * ------------------------------------------------------------*/
 
-#include "xy.h"
+#include "../xy.h"
 
 int
 main (int argc, char const *argv[])