Fix some md err

en/07.2.md

@@ -21,6 +21,7 @@ Suppose we have the JSON in the above example. How can we parse this data and ma
 	func Unmarshal(data []byte, v interface{}) error
 ```
 We can use this function like so:
+
 ```Go
 	package main
 	
@@ -69,12 +70,12 @@ Suppose we have the following JSON data:
 	b := []byte(`{"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}`)
 ```
 Now we parse this JSON to an interface{}:
-```Go`
+```Go
 	var f interface{}
 	err := json.Unmarshal(b, &f)
 ```
 The `f` stores a map, where keys are strings and values are interface{}'s'.
-```Go`
+```Go
 	f = map[string]interface{}{
 	    "Name": "Wednesday",
 	    "Age":  6,
@@ -85,7 +86,7 @@ The `f` stores a map, where keys are strings and values are interface{}'s'.
 	}
 ```
 So, how do we access this data? Type assertion.
-```Go`
+```Go
 	m := f.(map[string]interface{})
 ```
 After asserted, you can use the following code to access data:

en/07.6.md

@@ -103,9 +103,9 @@ The following functions are from the `strconv` package. As usual, please see off
 			str = strconv.AppendQuoteRune(str, '单')
 			fmt.Println(string(str))
 		}
-
+```
 - Format series, convert other data types into string.
-
+```Go
 		package main
 	
 		import (