just a little cleanup

src/main.rs

@@ -1,39 +1,36 @@
 use std::env;
 
+/* Not used, example of an enum
 #[derive(Debug)]
 enum Maybe<T> {
   Just(T),
   Nothing
 }
+*/
 
 fn main() {
     let arg = env::args().nth(1);
 
-  println!("{:?}", Maybe::Just(42));
+    // println!("{:?}", Maybe::Just(42));
 
     match arg {
         Some(result) => {
             let ip = ip_to_int(&result);
             println!("{:b}", ip);
-    },
-    None => println!("need one arg")
         }
-
-
-
+        None => println!("need one arg"),
+    }
 }
 
 fn ip_to_int(ip_str: &str) -> u32 {
-    let mut tbl : Vec<&str> = ip_str.split(".")
-      .collect();
+    let mut tbl: Vec<&str> = ip_str.split('.').collect();
     tbl.reverse();
 
     let mut ip = 0_u32;
 
     for (idx, s) in tbl.iter().enumerate() {
-    let nbr : u8 = s.parse()
-      .expect("parse fail");
-    ip += (nbr as u32) << 8*idx;
+        let nbr: u8 = s.parse().expect("parse fail");
+        ip += (nbr as u32) << (8 * idx);
     }
     ip
 }