tree 7a4ca7a58c689fa928eb4532e623987746ee08e9
parent d7762a4ae6c271b48649bbe9be2aac028e144e14
author Hao Zhu <haozhu233@gmail.com> 1597065641 -0400
committer Hao Zhu <haozhu233@gmail.com> 1597065641 -0400

simplify code