Going through social networks, I stumbled upon this code. It didn’t make much sense to me, except for the fact that there were 2 loops doing something with a large string. But when I compiled it (with a tiny modification), it gave a great result. Here’s code and result.
Since mid-last year, I started using a VPN service. Good for me, my VPN provider has both L2TP and OpenVPN services. L2TP is very easy to configure on Android phones (newer ones). But I find it unstable (may be my provider’s problem). So, I prefer OpenVPN as its stable.