format code in md

solutions/type-conversions/as.md

@@ -1,4 +1,5 @@
 1.
+
 ```rust
 fn main() {
     let decimal = 97.123_f32;
@@ -13,6 +14,7 @@ fn main() {
 ```
 
 2.
+
 ```rust
 // Suppress all warnings from casts which overflow.
 #![allow(overflowing_literals)]
@@ -24,6 +26,7 @@ fn main() {
 ```
 
 3.
+
 ```rust
 fn main() {
     assert_eq!(1000 as u16, 1000);
@@ -58,6 +61,7 @@ fn main() {
 ```
 
 4.
+
 ```rust
 fn main() {
     let mut values: [i32; 2] = [1, 2];
@@ -75,6 +79,7 @@ fn main() {
 ```
 
 5.
+
 ```rust
 fn main() {
     let arr :[u64; 13] = [0; 13];

solutions/type-conversions/from-into.md

@@ -1,4 +1,5 @@
 1.
+
 ```rust
 fn main() {
      // impl From<bool> for i32
@@ -28,6 +29,7 @@ fn main() {
 ```
 
 2.
+
 ```rust
 // From is now included in `std::prelude`, so there is no need to introduce it into the current scope
 // use std::convert::From;
@@ -56,6 +58,7 @@ fn main() {
 ```
 
 3.
+
 ```rust
 use std::fs;
 use std::io;
@@ -92,6 +95,7 @@ fn main() {
 ```
 
 4.
+
 ```rust
 fn main() {
     let n: i16 = 256;
@@ -111,6 +115,7 @@ fn main() {
 ```
 
 5.
+
 ```rust,editable
 #[derive(Debug, PartialEq)]
 struct EvenNum(i32);

solutions/type-conversions/others.md

@@ -1,4 +1,5 @@
 1
+
 ```rust
 use std::fmt;
 
@@ -23,6 +24,7 @@ fn main() {
 ```
 
 2.
+
 ```rust
 // To use `from_str` method, you needs to introduce this trait into the current scope.
 use std::str::FromStr;
@@ -38,6 +40,7 @@ fn main() {
 ```
 
 3.
+
 ```rust
 use std::str::FromStr;
 use std::num::ParseIntError;