Topological sort using streams - tsort utility#9

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wildcat26 wants to merge 4 commits intomasterfrom

Commits on Jul 27, 2020

Commits on Jul 28, 2020

Add function to build Adjacency list
wildcat26
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Commits on Aug 2, 2020

DFS uses general monad m but buildAdjList works with IO only, general stream type
wildcat26
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