040000 tree 5cd5462994ef52a634c01c40e97f2dfb253f6aaf	build
040000 tree 2811d7c79a930c9f9b645b60d839dd7401f9c580	it
040000 tree 2cae4571f1c9e710efecd40a9d46ad7e5a81d443	main
040000 tree 9a484568492996141249234b79564edae15d9c34	test