040000 tree 5cd5462994ef52a634c01c40e97f2dfb253f6aaf	build
040000 tree e3948b71d8b4a4dc1574329c0d45dcf58b72098c	it
040000 tree 7e1b279716722ecacf5e4b3fafc4b4bee8d2ee8b	main
040000 tree 02d5dc6d47caf5bca37925de0e8bfbd3edbc52f7	test