Follow-up from "Resolve "【codegen】：优化代码生成阶段的实现，提高稳定性""

The following discussion from !301 (merged) should be addressed:

• @chenyang.wang started a discussion:

  不应该重复读取文件内容。通过文件名去重文件后，将临时文件重命名为最终文件即可。