diff --git a/simple-structure/package-str/example/main.go b/simple-structure/package-str/example/main.go
index 0907b98..6f1ba55 100644
--- a/simple-structure/package-str/example/main.go
+++ b/simple-structure/package-str/example/main.go
@@ -9,4 +9,19 @@ func main() {
 	great.Hello()
 	fmt.Println(great.Name)
 	// fmt.Println(great.name2) // ERROR lowercase variables cannot be used outside of package itself
+
+	car1 := great.Car{Name: "bmw", Color: "red"}
+	// car1_1 := great.Car{"bmw", "red"} // TODO WHY THIS GIVES WARNING
+	fmt.Println(car1) // same with fmt.Println(car1.String()), bcs fmt uses String() by default
+
+	// car2 := great.car2{Name: "ford", Color: "green"} // ERROR lowercase structs cannot be used outside of package itself
+
+	fmt.Printf("\n\n")
+
+	// car3 := great.Car3{Name: "ford", color: "green"} // unknown field color, also lowercase struct variables cannot be used outside of package itself
+
+	car3_1 := great.Car3{}
+	car3_1.Name = "ford"
+	// car3_1.color = "green" // undefined
+	fmt.Println(car3_1)
 }
diff --git a/simple-structure/package-str/great/great.go b/simple-structure/package-str/great/great.go
index e91fb58..a910195 100644
--- a/simple-structure/package-str/great/great.go
+++ b/simple-structure/package-str/great/great.go
@@ -5,6 +5,33 @@ import "fmt"
 var Name = "deniz"
 var name2 = "deniz2"
 
+type Car struct {
+	Name  string
+	Color string
+}
+
+func (c Car) String() string {
+	return fmt.Sprintf("car color:%q | name:%q", c.Color, c.Name)
+}
+
+type car2 struct {
+	Name  string
+	Color string
+}
+
+func (c car2) String() string {
+	return fmt.Sprintf("car color:%q | name:%q", c.Color, c.Name)
+}
+
+type Car3 struct {
+	Name  string
+	color string
+}
+
+func (c Car3) String() string {
+	return fmt.Sprintf("car color:%q | name:%q", c.color, c.Name)
+}
+
 func Hello() {
 	fmt.Println("Hello World (go-organization/simple-structure/package-str/great/great.go)")
 }