040000 tree 5cd5462994ef52a634c01c40e97f2dfb253f6aaf	build
040000 tree 39e39252a6af29e4f6b6891d3999a411d28deed1	it
040000 tree 81d47dcf63ac624a38d1c5728e1a0d4c727e5bd0	main
040000 tree ac354f9c742a4b8a8db3e28cd92b1cc2c449ce61	test