Optimizing an Elixir puzzle: Rock Paper Scissors

Questions & Help Questions
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FYI, here’s the comparison to my and to original solution for 100_000 chars:

100000-nobbz             246.44
100000-prepending         41.99 - 5.87x slower +19.76 ms
100000-appending           0.49 - 503.66x slower +2039.71 ms