fix: coding style and file format for all example.

eBook/examples/chapter_16/pointer_interface.go

@@ -1,31 +1,30 @@
-// nexter.go
-package main
-
-import (
-	"fmt"
-)
-
-type nexter interface {
-    next() byte
-}
-
-
-func nextFew1(n nexter, num int) []byte {
-	var b []byte
-	for i:=0; i < num; i++ {
-		b[i] = n.next()
-	}
-	return b
-}
-
-func nextFew2(n *nexter, num int) []byte {
-	var b []byte
-	for i:=0; i < num; i++ {
-		b[i] = n.next() // compile error:  n.next undefined (type *nexter has no field or method next)
-	}
-	return b
-}
-
-func main() {
-	fmt.Println("Hello World!")
-}
+// nexter.go
+package main
+
+import (
+	"fmt"
+)
+
+type nexter interface {
+	next() byte
+}
+
+func nextFew1(n nexter, num int) []byte {
+	var b []byte
+	for i := 0; i < num; i++ {
+		b[i] = n.next()
+	}
+	return b
+}
+
+func nextFew2(n *nexter, num int) []byte {
+	var b []byte
+	for i := 0; i < num; i++ {
+		b[i] = n.next() // compile error:  n.next undefined (type *nexter has no field or method next)
+	}
+	return b
+}
+
+func main() {
+	fmt.Println("Hello World!")
+}