If the path is same, both the lines should be saved in one file and in different files. [emphasis added]

I don't understand this statement.

Update: I also don't understand why is not possible to provide an exact example of an input file you wish to parse (in  <code> tags), less than a dozen lines would seem enough, and also exact examples of the output files produced from the example input file (again, in  <code> tags). You've already done the first (maybe — see davido's comments here), so the output files would not seem a much greater step. Please see this. Having exact examples of both input and output might go a long way toward clarifying the situation.

I have commented below everything, please check and help.

There are plenty of problems with the code in Re: Copying files from one file to another file. If you go through the Basic debugging checklist first you may solve most of them.