Add function "iterate_ttl"

src/main.rs

@@ -32,8 +32,30 @@ fn main() {
     let mut current_ttl = options.first_ttl;
 
     while !reached_host && current_ttl <= options.max_ttl {
-        let mut current_address: Option<IpAddr> = None;
+        let current_address = iterate_ttl(
+            &options,
+            &host,
+            socket,
+            current_ttl,
+        );
 
+        if let Some(ip_addr) = current_address {
+            println!("{} {}", current_ttl, ip_addr);
+        }
+        else {
+            println!("{} ***", current_ttl);
+        }
+
+        current_ttl += 1;
+    }
+}
+
+fn iterate_ttl(
+    options: &Options,
+    host: &IpAddr,
+    socket: libc::c_int,
+    current_ttl: u8,
+) -> Option<IpAddr> {
     for sequence in 0..options.nqueries {
         let request = Request::new(0, sequence);
 
@@ -59,19 +81,11 @@ fn main() {
                 continue
             }
 
-                current_address = Some(response.source);
+            return Some(response.source)
         }
     }
 
-        if let Some(ip_addr) = current_address {
-            println!("{} {}", current_ttl, ip_addr);
-        }
-        else {
-            println!("{} ***", current_ttl);
-        }
-
-        current_ttl += 1;
-    }
+    return None
 }
 
 fn send_request(