使用edge浏览器下载B站视频的时候文件格式后缀为.crdownload
使用edge浏览器下载B站视频的时候文件格式后缀为.crdownload 在B站下载好视频到本地，想通过媒体播发器播放，发现文件格式是.crdownload ,没用可以使用的播发器 查阅资料发现.crdownload格式
原本 .crdownload 文件是 浏览器在下载时创建的缓存文件，下载完成时会重命名为原始文件的名称。
因为在文件名称中发现.mp4结尾的文件；尝试删除文件的后缀 .crdownload； 删完发现后缀变为.mp4
因为文件太多了，这样操作太无聊。因此写一小段代码来实现这个功能
step1:
下载代码（.net 8.0）
step2:
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