725 首次提交联系
delete trash files. (using: git add -u)
restore file: welcome

using command:
git checkout HEAD~1 -- welcome.txt
改名测试
测试悔棋操作
天啊，我又后悔了，幸好我有悔棋绝招^_^
应该能够成功
a is a good boy.
b is a good boy
c is a good boy
e is a good boy
f is a good boy
good
good
good
good
good
2013728 firt commit