add chapter 5 and refactor root path

chapter4/hi/main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"golang-book/head-first-go/chapter4/greeting"
+	"headfirstgo/headfirstgo/chapter4/greeting"
 )
 
 func main() {

chapter4/hi/main.go~

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+	"headfirstgo/headfirstgo/chapter4/greeting"
+)
+
+func main() {
+	greeting.Hello()
+	greeting.Hi()
+
+	slc := []string{"hello", "world"}
+	fmt.Printf("%s %T %T", slc[0], slc, true)
+}

chapter4/passfail/pass_fail.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"golang-book/head-first-go/chapter4/keyboard"
+	"headfirstgo/headfirstgo/chapter4/keyboard"
 	"log"
 )
 

chapter4/passfail/pass_fail.go~

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"headfirstgo/headfirstgo/chapter4/keyboard"
+	"log"
+)
+
+func main() {
+	fmt.Print("Enter a grade: ")
+	grade, err := keyboard.GetFloat()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var status string
+	if grade >= 60 {
+		status = "passing"
+	} else {
+		status = "failing"
+	}
+	fmt.Println("A grade of", grade, "is", status)
+}

chapter4/tocelsius/tocelsius.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"golang-book/head-first-go/chapter4/keyboard"
+	"headfirstgo/headfirstgo/chapter4/keyboard"
 	"log"
 )
 

chapter4/tocelsius/tocelsius.go~

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+	"headfirstgo/headfirstgo/chapter4/keyboard"
+	"log"
+)
+
+func main() {
+	fmt.Print("Enter a temperature in Farenheit: ")
+	farenheit, err := keyboard.GetFloat()
+	if err != nil {
+		log.Fatal(err)
+	}
+	celsius := (farenheit - 32) * 5 / 9
+	fmt.Printf("%0.2f degrees Celsius\n", celsius)
+}