Format and remove en/01.2.md spaces

en/01.2.md

@@ -34,18 +34,18 @@ Execute following commands. ( ***Now author goes back to talk examples*** )
 	mkdir mymath
 
 Create a new file called `sqrt.go`, type the following content to your file.
+```Go
+// Source code of $GOPATH/src/mymath/sqrt.go
+package mymath
 
-	// Source code of $GOPATH/src/mymath/sqrt.go
-	package mymath
-
-	func Sqrt(x float64) float64 {
-		z := 0.0
-		for i := 0; i < 1000; i++ {
-			z -= (z*z - x) / (2 * x)
-		}
-		return z
+func Sqrt(x float64) float64 {
+	z := 0.0
+	for i := 0; i < 1000; i++ {
+		z -= (z*z - x) / (2 * x)
 	}
-
+	return z
+}
+```	
 Now my package directory has been created and it's code has been written. I recommend that you use the same name for your packages as their corresponding directories, and that the directories contain all of the package source files.
 
 ## Compile packages
@@ -76,17 +76,17 @@ Write the following content to main.go.
 
 ```Go
 
-	//$GOPATH/src/mathapp/main.go source code.
-	package main
-	
-	import (
-		"mymath"
-		"fmt"
-	)
-	
-	func main() {
-		fmt.Printf("Hello, world. Sqrt(2) = %v\n", mymath.Sqrt(2))
-	}
+//$GOPATH/src/mathapp/main.go source code.
+package main
+
+import (
+"mymath"
+"fmt"
+)
+
+func main() {
+fmt.Printf("Hello, world. Sqrt(2) = %v\n", mymath.Sqrt(2))
+}
 ```
 
 To compile this application, you need to switch to the application directory, which in this case is `$GOPATH/src/mathapp`, then execute the `go install` command. Now you should see an executable file called `mathapp` was generated in the directory `$GOPATH/bin/`. To run this program, use the `./mathapp` command. You should see the following content in your terminal. 
@@ -120,7 +120,7 @@ Actually, `go get` clones source code to the $GOPATH/src of the local file syste
 
 You can use remote packages in the same way that we use local packages.
 ```Go
-	import "github.com/astaxie/beedb"
+import "github.com/astaxie/beedb"
 ```
 ## Directory complete structure