Interesting puzzle. 😊
There isn't much data given about Sunil. If he originally lived in the village, then he can't be the killer, since the latter grew up in Mumbai with Kumar. But it's only said that he wanted to be a farmer and it's also possible he moved from one city to another, so options are open. Rahul is unlikely to be the culprit, since the latter's leg has been amputated and as such there's no way he can participate in a race (though I do know that there are also races held for disabled people, using wheelchairs etc). His drinking habit seems to be more of a red herring.
The crux of the puzzle seems to revolve around Karan and Mukesh. It's mentioned that Mukesh and Karan built their last computers together, so Mukesh certainly knows stuff about how to build one. Why then, does he need Karan's help alone to build this one? Or has Karan actually asked to be involved? It is possible that Mukesh's computer or hard drive contains some valuable material that the murderer was after. The possible options I'm considering at a quick glance are -
1) Karan tries to get the computer file, and kills Mukesh when he finds out about it. But it's been said that Karan had to install the computer next week, so there's a contradiction since he had a much cleaner shot at it then.
2) Sunil is Kumar's brother, and they moved to Delhi from Mumbai. However, Kumar had met Mukesh 6 months ago and possibly Sunil incidentally learns about this file. He can probably use this material for some good bucks and buy land for his farm, but Kumar suspects his ideas and warns him against them. So a while after Kumar is busy with the marathon, Sunil quietly travels to Mumbai and threatens or bribes Karan into getting the file for him since Mukesh trusts the latter and thus he has easier access to the material, then kills Karan after the work is done. It's also possible he does it personally and kills Mukesh in the process.
I'm considering the second option as of now. Will try to think more later.
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