add some new idea
add a reverting commit test
Revert "add a reverting commit test"

This reverts commit c889ca8877413524d6ba84ee0f476222f1b270c6.
Revert "Revert "add a reverting commit test""

This reverts commit c20e9a0bdb9d782310c303bfe371a191853796b7.
recover fiels
Merge branch 'master' of https://github.com/lszhu/gitstudy