fix: coding style and file format for all example.

eBook/examples/chapter_4/gotemplate.go

@@ -1,30 +1,30 @@
-package main
-
-import (
-	"fmt"
-)
-
-const c = "C"
-
-var v int = 5
-
-type T struct{}
-
-func init() {
-	// initialization of package
-}
-
-func main() {
-	var a int
-	Func1()
-	// ...
-	fmt.Println(a)
-}
-
-func (t T) Method1() {
-	//...
-}
-
-func Func1() { // exported function Func1
-	//...
-}
+package main
+
+import (
+	"fmt"
+)
+
+const c = "C"
+
+var v int = 5
+
+type T struct{}
+
+func init() {
+	// initialization of package
+}
+
+func main() {
+	var a int
+	Func1()
+	// ...
+	fmt.Println(a)
+}
+
+func (t T) Method1() {
+	//...
+}
+
+func Func1() { // exported function Func1
+	//...
+}