Adding automatic IP address, some refactor and better texts. Upgrading version.

src/ifconfig.rs

@@ -0,0 +1,4 @@
+pub fn extract_public_ip() -> Result<String, ureq::Error> {
+    let body = ureq::get("https://ifconfig.me/ip").call()?.into_string()?;
+    Ok(body)
+}