Please consider this change for duplicate questions.
Instead of closing/flagging as duplicate, have a link provided which redirects to a question(s) that already exists. Sometimes people do not understand the actual question and will close it as a duplicate, when it perhaps is not really a duplicate.
If you provide this type of facility, the user who asked the question will get a chance to select from the marked duplicates and its answers, which are suggested by the other users, then they can choose to link that question to its original and have it directly closed.
If it is not a match, he can explain why, and what is different about it
people have to suggest which is similar question available
if user get answer from that suggested link. he/she join his/her question with that question. and then automatically question will close.