Convert LUA script to C# and improve performance on given data. -- 4 - 15/11/2017 10:08 EST

I need to convert my lua script over to an c# app. the lua script makes use of basic file, text and array functions, to perform a match renaming task I need the c# app to perform the same tasks as the lua,on the given test data and have some performance increased where possible by using of better methods. test data: [login to view URL]