Quick Job: Write NET app to merge multiple Excel sheets into one: Bulk support

I need a quick solution to combine multiple Excel sheets into one and need you to write a NET app that can handle multiple Excel files and do it for all Example: Select multiple Excel files (each file has multiple sheets) => right-click => Click merge sheets => Output will be MULTIPLE files each with only 1 sheet Please understand the difference, I don't want to merge multiple Excel files into one single file, instead each file should remain as it is but with merge sheets. This should be a quick job, best bid will win, if you can do it for $70 that would be great