I have a Maruti Alto LXI, suddenly the interior car light has stopped working.?

What can be the reasons for it and how do I fix it?
Update: I should have said this before, bulb is fine but when I try to connect another bulb using a wire, it doesn't lit. But 2 days ago when I was washing my car the interior bulb starting to work. So the possibility of it not having current also ruled out. Please help me, I am confused.
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