2024: Add util.zig

2024/util.zig

@@ -0,0 +1,11 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn readAllInput(day: u8, allocator: std.mem.Allocator) ![]const u8 {
+    var fileName: [16]u8 = undefined;
+    const inputFile = try std.fmt.bufPrint(&fileName, "day{d}.txt", .{day});
+    const file = try std.fs.cwd().openFile(inputFile, .{});
+    defer file.close();
+    const stat = try file.stat();
+    return try file.reader().readAllAlloc(allocator, stat.size);
+}