fn formatHtml(bytes: []const u8, w: *Writer) Writer.Error!void
fn formatHtml(bytes: []const u8, w: *Writer) Writer.Error!void { for (bytes) |b| switch (b) { '<' => try w.writeAll("<"), '>' => try w.writeAll(">"), '&' => try w.writeAll("&"), '"' => try w.writeAll("""), else => try w.writeByte(b), }; }