evolve: revision graph

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evolve: update some comments
Thu, 20 Aug 2020 23:54:27 +0530, by Sushil khanchi
evolve: no need to return divergent and other
Fri, 21 Aug 2020 01:04:08 +0530, by Sushil khanchi
evolve: remove an evolvestate which is no more required
Fri, 21 Aug 2020 00:56:24 +0530, by Sushil khanchi
evolve: remove swapping nodes logic while resolving divergence
Sun, 20 Sep 2020 09:22:04 +0530, by Sushil khanchi

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