Format and remove en/02.x.md spaces

en/02.4.md

@@ -33,15 +33,15 @@ There are three more ways to define a struct.
 
 - Assign initial values by order
 ```Go
-	P := person{"Tom", 25}
+P := person{"Tom", 25}
 ```	
 - Use the format `field:value` to initialize the struct without order
 ```Go
-	P := person{age:24, name:"Bob"}
+P := person{age:24, name:"Bob"}
 ```
 - Define an anonymous struct, then initialize it
 ```Go
-	P := struct{name string; age int}{"Amy",18}
+P := struct{name string; age int}{"Amy",18}
 ```		
 Let's see a complete example.
 ```Go
@@ -141,8 +141,8 @@ Figure 2.7 Embedding in Student and Human
 
 We see that we can access the `age` and `name` fields in Student just like we can in Human. This is how embedded fields work. It's very cool, isn't it? Hold on, there's  something cooler! You can even use Student to access Human in this embedded field!
 ```Go
-	mark.Human = Human{"Marcus", 55, 220}
-	mark.Human.age -= 1
+mark.Human = Human{"Marcus", 55, 220}
+mark.Human.age -= 1
 ```	
 All the types in Go can be used as embedded fields.
 ```Go