feat(day_6): part A done and B tried with dirty strategy

src/__tests__/day_6_test.ts

@@ -0,0 +1,22 @@
+import { assertEquals } from "@std/assert";
+import {
+  operate,
+  read_problems,
+  read_problems_as_cephalopod,
+} from "../exercises/day_6.ts";
+
+Deno.test("Day 6 - A", async () => {
+  const problem_list = await read_problems(
+    "src/exercises/assets/day_6_test_input.txt",
+  );
+  const result = operate(problem_list);
+  assertEquals(result, 4277556);
+});
+
+Deno.test("Day 6 - B", async () => {
+  const problem_list = await read_problems_as_cephalopod(
+    "src/exercises/assets/day_6_test_input.txt",
+  );
+  const result = operate(problem_list);
+  assertEquals(result, 3263827);
+});