using io.SectionReader in Go

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For my last task I was moving to an offset value in huge byte stream using reader.Seek(int64(offset), whence) and reading the bytes there. But it was not good for the performance because I was moving in a big file(~1gigs). Then I came to know about io.SectionReader and it made my life easier and helped me delete a lot of code(isn’t that best). I create the section reader using this function:

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