update book code

eBook/examples/chapter_10/embed_func2.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+)
+
+type Log struct {
+	msg string
+}
+
+type Customer struct {
+    Name	string
+    Log
+}
+
+func main() {
+	c := &Customer{"Barak Obama", Log{"1 - Yes we can!"}}
+	c.Add("2 - After me the world will be a better place!")
+	fmt.Println(c)
+}
+
+func (l *Log) Add(s string) {
+	l.msg += "\n" + s
+}
+
+func (c *Customer) String() string {
+	return c.Name + "\nLog:" + fmt.Sprintln(c.Log)
+}
+
+func (l *Log) String() string {
+	return l.msg
+}
+
+/* Output:
+Barak Obama
+Log:{1 - Yes we can!
+2 - After me the world will be a better place!}
+*/