- Fix #117
移动时，如果目标文件已存在，以前版本会加后缀防止覆盖。当前版本会判断两个文件md5值是否一致，一致则覆盖，不一致才加后缀。
When moving, if the target file already exists, the previous version will add a suffix to prevent overwriting. The current version will determine whether the md5 values of the two files are consistent. If they are consistent, they will be overwritten. If they are inconsistent, a suffix will be added.