Replace interface reference with Composition

chainOfResponsibility/cashier.go

@@ -3,14 +3,14 @@ package main
 import "fmt"
 
 type Cashier struct {
-	next Department
+	DepartmentBase
 }
 
 func (c *Cashier) execute(p *Patient) {
 	if p.paymentDone {
 		fmt.Println("Payment Done")
 	}
-	fmt.Println("Cashier getting money from patient patient")
+	fmt.Println("Cashier getting money from patient:", p.name)
 }
 
 func (c *Cashier) setNext(next Department) {

chainOfResponsibility/departmentBase.go

@@ -1,5 +1,5 @@
 package main
 
 type DepartmentBase struct {
-	nextDepartment Department
+	next Department
 }

chainOfResponsibility/doctor.go

@@ -3,7 +3,7 @@ package main
 import "fmt"
 
 type Doctor struct {
-	next Department
+	DepartmentBase
 }
 
 func (d *Doctor) execute(p *Patient) {
@@ -12,7 +12,7 @@ func (d *Doctor) execute(p *Patient) {
 		d.next.execute(p)
 		return
 	}
-	fmt.Println("Doctor checking patient")
+	fmt.Println("Doctor checking patient:", p.name)
 	p.doctorCheckUpDone = true
 	d.next.execute(p)
 }

chainOfResponsibility/medical.go

@@ -3,16 +3,16 @@ package main
 import "fmt"
 
 type Medical struct {
-	next Department
+	DepartmentBase
 }
 
 func (m *Medical) execute(p *Patient) {
 	if p.medicineDone {
-		fmt.Println("Medicine already given to patient")
+		fmt.Println("Medicine already given to patient:", p.name)
 		m.next.execute(p)
 		return
 	}
-	fmt.Println("Medical giving medicine to patient")
+	fmt.Println("Medical giving medicine to patient:", p.name)
 	p.medicineDone = true
 	m.next.execute(p)
 }

chainOfResponsibility/reception.go

@@ -3,7 +3,7 @@ package main
 import "fmt"
 
 type Reception struct {
-	next Department
+	DepartmentBase
 }
 
 func (r *Reception) execute(p *Patient) {
@@ -12,7 +12,7 @@ func (r *Reception) execute(p *Patient) {
 		r.next.execute(p)
 		return
 	}
-	fmt.Println("Reception registering patient")
+	fmt.Println("Reception registering patient:", p.name)
 	p.registrationDone = true
 	r.next.execute(p)
 }