update book code

eBook/examples/chapter_14/goroutine3.go

@@ -0,0 +1,29 @@
+package main
+
+import "fmt"
+
+func main() {
+	ch := make(chan string)
+	go sendData(ch)
+	getData(ch)
+}
+
+func sendData(ch chan string) {
+	ch <- "Washington"
+	ch <- "Tripoli"
+	ch <- "London"
+	ch <- "Beijing"
+	ch <- "Tokio"
+	close(ch)
+}
+
+func getData(ch chan string) {
+	for {
+		input, open := <-ch
+		if !open {
+			break
+		}
+		fmt.Printf("%s ", input)
+	}
+}
+// Washington Tripoli London Beijing Tokio