ConvertXlsToXlsX

On vscode Convert Xls To XlsX by NPOI

1. Run C# on vscode please refer https://docs.microsoft.com/en-us/dotnet/core/tutorials/with-visual-studio-code
2. Add NPOI to your project, type this in terminal > dotnet add package NPOI --version 2.5.1
3. Generate .exe file, type this in terminal > dotnet build -r win-x64