Given the strings: - `http://www.a.com http://www.b.com` - `http://www.a.com, http://www.b.com, and http://www.c.com.` Expected output: - `<a href="http://www.a.com" target="_self">http://www.a.com</a> <a href="http://www.b.com" target="_self">http://www.b.com</a>` - `<a href="http://www.a.com" target="_self">http://www.a.com</a>, <a href="http://www.b.com" target="_self">http://www.b.com</a>, and <a href="http://www.c.com" target="_self">http://www.c.com</a>.` Observed output: - `<a href="http://www.a.com" target="_self">http://www.a.com</a> http://www.b.com` - `http://www.a.com, http://www.b.com, and http://www.c.com.`