Small Fix && cargo fmt

user/src/bin/huge_write.rs

@@ -4,13 +4,7 @@
 #[macro_use]
 extern crate user_lib;
 
-use user_lib::{
-    OpenFlags,
-    open,
-    close,
-    write,
-    get_time,
-};
+use user_lib::{close, get_time, open, write, OpenFlags};
 
 #[no_mangle]
 pub fn main() -> i32 {
@@ -25,12 +19,15 @@ pub fn main() -> i32 {
     let f = f as usize;
     let start = get_time();
     let size_mb = 1usize;
-    for _ in 0..1024*size_mb {
+    for _ in 0..1024 * size_mb {
         write(f, &buffer);
     }
     close(f);
     let time_ms = (get_time() - start) as usize;
     let speed_kbs = size_mb * 1000000 / time_ms;
-    println!("{}MiB written, time cost = {}ms, write speed = {}KiB/s", size_mb, time_ms, speed_kbs);
+    println!(
+        "{}MiB written, time cost = {}ms, write speed = {}KiB/s",
+        size_mb, time_ms, speed_kbs
+    );
     0
 }