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import { assertEquals } from "https://deno.land/std@0.157.0/testing/asserts.ts";
import repeatedCharacter from "./index.ts";
Deno.test("first-letter-to-appear-twice", () => {    const inputs = ["abccbaacz", "abcdd", "yyabccbaacz", "yyabcdd"];    const outputs = ["c", "d", "y", "y"];    assertEquals(outputs, inputs.map(repeatedCharacter));});