Attribute values are extracted incorrectly when they are not enclosed in quotation marks. #2

When using the check_links utility, a problem was discovered. If attributes within an HTML document are not enclosed in quotes (and this is permissible in some cases, for example, when the value does not contain spaces or special characters and many minifiers do this), the attribute value is extracted incorrectly.

How to reproduce

Test HTML document:

<!DOCTYPE html>
<html lang=en>
<head>
	<meta charset=UTF-8>
	<meta name=viewport content="width=device-width, initial-scale=1.0">
	<title>Document</title>
</head>
<body>
	<a href=books/learning-zig/chapter11/ class=link>Chapter 11</a>
</body>
</html>

If you load this document using the zigquery library and then try to retrieve the a tag, for example like this:

    var doc = try zq.Document.initFromSlice(allocator, html);
    defer doc.deinit();

    // Extract all <A>
    const sel_a = try doc.find("a");
    var it_a = sel_a.iterator();
    while (it_a.next()) |el_a| {
        const attr_href = el_a.attr("href");
        if (attr_href) |href| {
            std.debug.print("{s}\n", .{ href });
        }
    }

It will print “books” instead of the expected “books/learning-zig/chapter11/”.