fix: coding style and file format for chapter 11, 12, 13, 14 and 15.

eBook/exercises/chapter_11/simple_interface2.go

@@ -1,61 +1,62 @@
-// simple_interface2.go
-package main
-
-import (
-	"fmt"
-)
-
-type Simpler interface {
-	Get() int
-	Set(int)
-}
-
-type Simple struct {
-	i int
-}
-
-func (p *Simple) Get() int {
-	return p.i
-}
-
-func (p *Simple) Set(u int) {
-	p.i = u
-}
-
-type RSimple struct {
-	i int
-	j int
-}
-
-func (p *RSimple) Get() int {
-	return p.j
-}
-
-func (p *RSimple) Set(u int) {
-	p.j = u
-}
-
-func fI(it Simpler) int {
-	switch it.(type) {
-	case *Simple:
-			it.Set(5)
-			return it.Get()
-	case *RSimple:
-			it.Set(50)
-			return it.Get()
-	default:
-			return 99
-	}
-	return 0
-}
-
-func main() {
-	var s Simple
-	fmt.Println(fI(&s))  // &s is required because Get() is defined with a receiver type pointer
-	var r RSimple
-	fmt.Println(fI(&r))  
-}
-/* Output: 
-5
-50
-*/
+// simple_interface2.go
+package main
+
+import (
+	"fmt"
+)
+
+type Simpler interface {
+	Get() int
+	Set(int)
+}
+
+type Simple struct {
+	i int
+}
+
+func (p *Simple) Get() int {
+	return p.i
+}
+
+func (p *Simple) Set(u int) {
+	p.i = u
+}
+
+type RSimple struct {
+	i int
+	j int
+}
+
+func (p *RSimple) Get() int {
+	return p.j
+}
+
+func (p *RSimple) Set(u int) {
+	p.j = u
+}
+
+func fI(it Simpler) int {
+	switch it.(type) {
+	case *Simple:
+		it.Set(5)
+		return it.Get()
+	case *RSimple:
+		it.Set(50)
+		return it.Get()
+	default:
+		return 99
+	}
+	return 0
+}
+
+func main() {
+	var s Simple
+	fmt.Println(fI(&s)) // &s is required because Get() is defined with a receiver type pointer
+	var r RSimple
+	fmt.Println(fI(&r))
+}
+
+/* Output:
+5
+50
+*/