diff --git a/eBook/exercises/chapter_5/bitwise_complement.go b/eBook/exercises/chapter_5/bitwise_complement.go
index d113263..0c9af34 100755
--- a/eBook/exercises/chapter_5/bitwise_complement.go
+++ b/eBook/exercises/chapter_5/bitwise_complement.go
@@ -1,22 +1,23 @@
-package main
-
-import "fmt"
-
-func main() {
-	for i:=0; i <= 10; i ++ {
-			fmt.Printf("the complement of %b is: %b\n", i, ^i)
-	}
-}
-/* Output:
-the complement of 0 is: -1
-the complement of 1 is: -10
-the complement of 10 is: -11
-the complement of 11 is: -100
-the complement of 100 is: -101
-the complement of 101 is: -110
-the complement of 110 is: -111
-the complement of 111 is: -1000
-the complement of 1000 is: -1001
-the complement of 1001 is: -1010
-the complement of 1010 is: -1011
-*/
\ No newline at end of file
+package main
+
+import "fmt"
+
+func main() {
+	for i := 0; i <= 10; i++ {
+		fmt.Printf("the complement of %b is: %b\n", i, ^i)
+	}
+}
+
+/* Output:
+the complement of 0 is: -1
+the complement of 1 is: -10
+the complement of 10 is: -11
+the complement of 11 is: -100
+the complement of 100 is: -101
+the complement of 101 is: -110
+the complement of 110 is: -111
+the complement of 111 is: -1000
+the complement of 1000 is: -1001
+the complement of 1001 is: -1010
+the complement of 1010 is: -1011
+*/
diff --git a/eBook/exercises/chapter_5/fizzbuzz.go b/eBook/exercises/chapter_5/fizzbuzz.go
index ffa16dc..c41f957 100755
--- a/eBook/exercises/chapter_5/fizzbuzz.go
+++ b/eBook/exercises/chapter_5/fizzbuzz.go
@@ -1,24 +1,24 @@
-package main
-
-import "fmt"
-
-const (
-	FIZZ=3
-	BUZZ=5
-	FIZZBUZZ=15
-)
-
-func main() {
-	for i:=0; i <= 100; i++ {
-		switch {
-			case i%FIZZBUZZ==0:
-				fmt.Println("FizzBuzz")
-			case i%FIZZ==0:
-				fmt.Println("Fizz")
-			case i%BUZZ==0:
-				fmt.Println("Buzz")
-			default:
-				fmt.Println(i)
-		}
-	}
-}
\ No newline at end of file
+package main
+
+import "fmt"
+
+const (
+	FIZZ     = 3
+	BUZZ     = 5
+	FIZZBUZZ = 15
+)
+
+func main() {
+	for i := 0; i <= 100; i++ {
+		switch {
+		case i%FIZZBUZZ == 0:
+			fmt.Println("FizzBuzz")
+		case i%FIZZ == 0:
+			fmt.Println("Fizz")
+		case i%BUZZ == 0:
+			fmt.Println("Buzz")
+		default:
+			fmt.Println(i)
+		}
+	}
+}
diff --git a/eBook/exercises/chapter_5/for_character.go b/eBook/exercises/chapter_5/for_character.go
index 2653f38..2fd5923 100755
--- a/eBook/exercises/chapter_5/for_character.go
+++ b/eBook/exercises/chapter_5/for_character.go
@@ -1,17 +1,17 @@
-package main
-
-func main() {
-	// 1 - use 2 nested for loops
-	for i:=1; i <= 25; i++ {
-		for j:=1; j <=i; j++ {
-			print("G")
-		}
-		println()
-	}
-	// 2 -  use only one for loop and string concatenation
-	str := "G"
-	for i:=1; i <= 25; i++ {
-		println(str)
-		str += "G"
-	}	
-}
\ No newline at end of file
+package main
+
+func main() {
+	// 1 - use 2 nested for loops
+	for i := 1; i <= 25; i++ {
+		for j := 1; j <= i; j++ {
+			print("G")
+		}
+		println()
+	}
+	// 2 -  use only one for loop and string concatenation
+	str := "G"
+	for i := 1; i <= 25; i++ {
+		println(str)
+		str += "G"
+	}
+}
diff --git a/eBook/exercises/chapter_5/for_loop.go b/eBook/exercises/chapter_5/for_loop.go
index a484f65..ae38663 100755
--- a/eBook/exercises/chapter_5/for_loop.go
+++ b/eBook/exercises/chapter_5/for_loop.go
@@ -1,16 +1,18 @@
-package main
-
-import "fmt"
-
-func main() {
-	// 1:
-	for i:=0; i < 15; i++ {
-		fmt.Printf("The counter is at %d\n", i)
-	}
-	// 2:
-	i := 0
-START:
-	fmt.Printf("The counter is at %d\n", i)
-	i++
-	if i < 15 { goto START }
-}
\ No newline at end of file
+package main
+
+import "fmt"
+
+func main() {
+	// 1:
+	for i := 0; i < 15; i++ {
+		fmt.Printf("The counter is at %d\n", i)
+	}
+	// 2:
+	i := 0
+START:
+	fmt.Printf("The counter is at %d\n", i)
+	i++
+	if i < 15 {
+		goto START
+	}
+}
diff --git a/eBook/exercises/chapter_5/i_undefined.go b/eBook/exercises/chapter_5/i_undefined.go
index d0c8840..2f79e4a 100755
--- a/eBook/exercises/chapter_5/i_undefined.go
+++ b/eBook/exercises/chapter_5/i_undefined.go
@@ -1,14 +1,14 @@
-// i_undefined.go
-package main
-
-import (
-	"fmt"
-)
-
-func main() {
-	var i int
-	for i=0; i<10; i++ {
-		fmt.Printf("%v\n", i)
-	}
-	fmt.Printf("%v\n", i)  //<-- compile error:  undefined i
-}
+// i_undefined.go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	var i int
+	for i = 0; i < 10; i++ {
+		fmt.Printf("%v\n", i)
+	}
+	fmt.Printf("%v\n", i) //<-- compile error:  undefined i
+}
diff --git a/eBook/exercises/chapter_5/multiple_for.go b/eBook/exercises/chapter_5/multiple_for.go
index b9b0649..2dcb9b5 100755
--- a/eBook/exercises/chapter_5/multiple_for.go
+++ b/eBook/exercises/chapter_5/multiple_for.go
@@ -1,17 +1,18 @@
-// multiple_for.go
-package main
-
-import "fmt"
-
-func main() {
-    //multiple initialization; a consolidated bool expression with && and ||; multiple ‘incrementation’
-    for i, j, s := 0, 5, "a"; i < 3 && j < 100 && s != "aaaaa"; i, j, s = i+1, 
-		j+1, s + "a"  {
-        fmt.Println("Value of i, j, s:", i, j, s)
-    }
-}
-/* Output:
-Value of i, j, s: 0 5 a
-Value of i, j, s: 1 6 aa
-Value of i, j, s: 2 7 aaa
-*/
\ No newline at end of file
+// multiple_for.go
+package main
+
+import "fmt"
+
+func main() {
+	//multiple initialization; a consolidated bool expression with && and ||; multiple ‘incrementation’
+	for i, j, s := 0, 5, "a"; i < 3 && j < 100 && s != "aaaaa"; i, j, s = i+1,
+		j+1, s+"a" {
+		fmt.Println("Value of i, j, s:", i, j, s)
+	}
+}
+
+/* Output:
+Value of i, j, s: 0 5 a
+Value of i, j, s: 1 6 aa
+Value of i, j, s: 2 7 aaa
+*/
diff --git a/eBook/exercises/chapter_5/rectangle_stars.go b/eBook/exercises/chapter_5/rectangle_stars.go
index a5eb7cb..1cc2efc 100755
--- a/eBook/exercises/chapter_5/rectangle_stars.go
+++ b/eBook/exercises/chapter_5/rectangle_stars.go
@@ -1,26 +1,27 @@
-// rectangle_stars.go
-package main
-
-import "fmt"
-
-func main() {
-	w, h := 20, 10
-	for y := 0; y < h; y++ {
-		for x := 0; x < w; x++ {
-			fmt.Print("*")
-		}
-		fmt.Println()
-	}
-}
-/* Output:
-********************
-********************
-********************
-********************
-********************
-********************
-********************
-********************
-********************
-********************
-*/
+// rectangle_stars.go
+package main
+
+import "fmt"
+
+func main() {
+	w, h := 20, 10
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			fmt.Print("*")
+		}
+		fmt.Println()
+	}
+}
+
+/* Output:
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+ */
diff --git a/eBook/exercises/chapter_5/season.go b/eBook/exercises/chapter_5/season.go
index ba200d5..178edc4 100755
--- a/eBook/exercises/chapter_5/season.go
+++ b/eBook/exercises/chapter_5/season.go
@@ -1,17 +1,21 @@
-package main
-
-import "fmt"
-
-func main() {
-	fmt.Printf(Season(3))
-}
-
-func Season(month int) string {
-	switch month {
-		case 12,1,2:  return "Winter"
-		case 3,4,5:	  return "Spring"
-		case 6,7,8:   return "Summer"
-		case 9,10,11: return "Autumn"
-	}
-	return "Season unknown"
-}
\ No newline at end of file
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Printf(Season(3))
+}
+
+func Season(month int) string {
+	switch month {
+	case 12, 1, 2:
+		return "Winter"
+	case 3, 4, 5:
+		return "Spring"
+	case 6, 7, 8:
+		return "Summer"
+	case 9, 10, 11:
+		return "Autumn"
+	}
+	return "Season unknown"
+}