format code in md

solutions/crate-module/crate.md

@@ -2,13 +2,14 @@
 
 2. `cargo new --lib hello-package1`
 
-3. `hello-package` has a binary crate named `hello-package`, `src/main.rs` is the crate root. 
-   
+3. `hello-package` has a binary crate named `hello-package`, `src/main.rs` is the crate root.
+
 `hello-pacakge1` has a library crate named `hello-package1`, `src/lib.rs` is the crate root.
 
 4. `hello-package1`
 
 5.
+
 ```shell
 # FILL in the blanks
 .
@@ -20,6 +21,7 @@
 ```
 
 6.
+
 ```shell
 # Create a package which contains 
 # 1. three binary crates: `hello-package`, `main1` and `main2`

solutions/crate-module/module.md

@@ -1,4 +1,5 @@
 1.
+
 ```rust
 // in lib.rs
 mod front_of_house {
@@ -21,6 +22,7 @@ mod front_of_house {
 ```
 
 2.
+
 ```rust
 // in lib.rs
 pub mod front_of_house {
@@ -53,6 +55,7 @@ pub fn eat_at_restaurant() {
 ```
 
 3.
+
 ```rust
 mod back_of_house {
     fn fix_incorrect_order() {
@@ -75,9 +78,8 @@ mod back_of_house {
 }
 ```
 
-
-
 4.
+
 ```rust
 // in src/lib.rs
 
@@ -104,7 +106,6 @@ pub fn fix_incorrect_order() {
 pub fn cook_order() {}
 ```
 
-
 ```rust
 // in src/front_of_house/mod.rs
 
@@ -136,8 +137,8 @@ pub fn take_payment() {}
 fn complain() {} 
 ```
 
-
 5.
+
 ```rust
 mod front_of_house;
 

solutions/crate-module/use-pub.md

@@ -1,4 +1,5 @@
 1.
+
 ```rust
 use std::fmt::Result;
 use std::io::Result as IoResult;
@@ -7,6 +8,7 @@ fn main() {}
 ```
 
 2.
+
 ```rust
 use std::collections::*;
 
@@ -29,8 +31,8 @@ fn main() {
 }
 ```
 
+3.
 
-3. 
 ```rust
 // in lib.rs