fix: coding style and file format for all example.

eBook/examples/chapter_5/switch2.go

@@ -1,16 +1,16 @@
-package main
-
-import "fmt"
-
-func main() {
-	var num1 int = 7
-
-	switch {
-	    case num1 < 0:
-		    fmt.Println("Number is negative")
-	    case num1 > 0 && num1 < 10:
-		    fmt.Println("Number is between 0 and 10")
-	    default:
-		    fmt.Println("Number is 10 or greater")
-	}
-}
+package main
+
+import "fmt"
+
+func main() {
+	var num1 int = 7
+
+	switch {
+	case num1 < 0:
+		fmt.Println("Number is negative")
+	case num1 > 0 && num1 < 10:
+		fmt.Println("Number is between 0 and 10")
+	default:
+		fmt.Println("Number is 10 or greater")
+	}
+}