fix: fix shell bug

.gitignore

@@ -69,6 +69,6 @@ Network Trash Folder
 Temporary Items
 .apdisk
 bochs_log.txt
-a.img
+*.img
 *.bin
 .vscode/

clean.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-rm -rf bochs_log.txt hd30M.img *.bin boot/*.bin kernel/kernel.bin kernel/main.o
+rm -rf bochs_log.txt hd30M.img *.bin boot/*.bin kernel/kernel.bin kernel/main.o lib/kernel/*.o