fix: coding style and file format for all example.

eBook/examples/chapter_12/echo.go

@@ -1,29 +1,29 @@
-package main
-
-import (
-	"os"
-	"flag" // command line option parser
-)
-
-var NewLine = flag.Bool("n", false, "print newline") // echo -n flag, of type *bool
-
-const (
-	Space   = " "
-	Newline = "\n"
-)
-
-func main() {
-	flag.PrintDefaults()
-	flag.Parse() // Scans the arg list and sets up flags
-	var s string = ""
-	for i := 0; i < flag.NArg(); i++ {
-		if i > 0 {
-			s += " "
-			if *NewLine {  // -n is parsed, flag becomes true
-				s += Newline
-			}
-		}
-		s += flag.Arg(i)
-	}
-	os.Stdout.WriteString(s)
-}
+package main
+
+import (
+	"flag" // command line option parser
+	"os"
+)
+
+var NewLine = flag.Bool("n", false, "print newline") // echo -n flag, of type *bool
+
+const (
+	Space   = " "
+	Newline = "\n"
+)
+
+func main() {
+	flag.PrintDefaults()
+	flag.Parse() // Scans the arg list and sets up flags
+	var s string = ""
+	for i := 0; i < flag.NArg(); i++ {
+		if i > 0 {
+			s += " "
+			if *NewLine { // -n is parsed, flag becomes true
+				s += Newline
+			}
+		}
+		s += flag.Arg(i)
+	}
+	os.Stdout.WriteString(s)
+}