fix: coding style and file format for all example.

eBook/examples/chapter_11/empty_interface.go

@@ -1,38 +1,38 @@
-package main
-
-import "fmt"
-
-var i = 5
-var str = "ABC"
-
-type Person struct {
-	name string
-	age	int
-}
-
-type Any interface{}
-
-func main() {
-	var val Any
-	val = 5
-	fmt.Printf("val has the value: %v\n", val)
-	val = str
-	fmt.Printf("val has the value: %v\n", val)
-	pers1 := new(Person)
-	pers1.name = "Rob Pike"
-	pers1.age = 55
-	val = pers1
-	fmt.Printf("val has the value: %v\n", val)
-	switch t := val.(type) {
-		case int:
-			fmt.Printf("Type int %T\n", t)
-		case string:
-			fmt.Printf("Type string %T\n", t)
-		case bool:
-   			fmt.Printf("Type boolean %T\n", t)
-		case *Person:
-   			fmt.Printf("Type pointer to Person %T\n", *t)
-		default:
-   			fmt.Printf("Unexpected type %T", t)
-	}
-}
+package main
+
+import "fmt"
+
+var i = 5
+var str = "ABC"
+
+type Person struct {
+	name string
+	age  int
+}
+
+type Any interface{}
+
+func main() {
+	var val Any
+	val = 5
+	fmt.Printf("val has the value: %v\n", val)
+	val = str
+	fmt.Printf("val has the value: %v\n", val)
+	pers1 := new(Person)
+	pers1.name = "Rob Pike"
+	pers1.age = 55
+	val = pers1
+	fmt.Printf("val has the value: %v\n", val)
+	switch t := val.(type) {
+	case int:
+		fmt.Printf("Type int %T\n", t)
+	case string:
+		fmt.Printf("Type string %T\n", t)
+	case bool:
+		fmt.Printf("Type boolean %T\n", t)
+	case *Person:
+		fmt.Printf("Type pointer to Person %T\n", *t)
+	default:
+		fmt.Printf("Unexpected type %T", t)
+	}
+}