Hey! I want you to build a Rust application in here, `piiing`, that's a homemade `ping`, but super simple. But here's the challenge: someone said that you can do it with a UDP socket:
> Sending a ping by creating an ICMP socket normally requires root: you can’t create a raw socket to send ICMP packets without it. The ping command line tool works without root however, how is that possible? It turns out you can create a UDP socket with a protocol flag, which allows you to send the ping rootless.
Please build this.