Refine setup

src/main.zig

@@ -0,0 +1,15 @@
+const std = @import("std");
+
+const day = @import("day");
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+
+    const allocator = arena.allocator();
+
+    std.debug.print("{s}\n", .{day.title});
+    try day.run(allocator);
+    std.debug.print("\n", .{});
+}
+