fix(day_6): part B done in a real dirty way, not happy but happy

src/exercises/day_6.ts

@@ -97,9 +97,9 @@ export async function read_problems_as_cephalopod(
 
   // FIXME: this is really the dirtiest shit I've ever seen
   const spaces: string[] = [];
-  spaces.fill(" ", 0, 400);
+  spaces.fill("0", 0, 400);
   const rows = problem_text.split("\n").map((row) =>
-    `${row}${spaces.join("")}-`
+    `${row}${spaces.join("")}`
   );
 
   const operands_row = rows.splice(-2);