This method converts a Sparse6 or Graph6 string S to an instance of the class Graph, stored in G.
i1 : stringToGraph "Dhc"
o1 = Graph{0 => {1, 4}}
1 => {0, 2}
2 => {1, 3}
3 => {2, 4}
4 => {0, 3}
o1 : Graph
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