title: Golang packages for doc to docx and docx to pdf convertion?
body: <p>I am writing a web application in Golang, in which user can upload a doc or docx file. Some of the file contents will be changed according to a predefined format. Later user can download the changed file either in docx or in pdf format. Now my application accepts only docx file, change the file according to predefined format and let the user download it back in docx format itself. Are there any packages available in golang to convert doc to docx and docx to pdf?</p>