Small Fix && cargo fmt

user/src/bin/pipetest.rs

@@ -4,7 +4,7 @@
 #[macro_use]
 extern crate user_lib;
 
-use user_lib::{fork, close, pipe, read, write, wait};
+use user_lib::{close, fork, pipe, read, wait, write};
 
 static STR: &str = "Hello, world!";
 
@@ -41,4 +41,4 @@ pub fn main() -> i32 {
         println!("pipetest passed!");
         0
     }
-}
+}