implmentation of help method in command interface

Former-commit-id: 655be5abcefa1cbf066197f850929f3a71c732a6

main.go

@@ -87,44 +87,64 @@ type config struct {
 
 type Command interface {
 	Run(args []string) (string, error)
+	Help(args []string) (string, error)
 }
 
-type HelpCmd struct {
+type DefaultCmd struct {
 }
 
-func (*HelpCmd) Run(args []string) (string, error) {
-	helpText := " this is help"
-	return helpText, nil
+type HelloCmd struct {
 }
 
-type DefaultCmd struct {
+type HelpCmd struct {
+	
 }
 
 func (*DefaultCmd) Run(args []string) (string, error) {
 	return "Type help to get available commands", nil
 }
 
-type HelloCmd struct {
+func (*DefaultCmd) Help(args []string) (string, error) {
+	return "Help of Default", nil
+}
+
+func (*HelpCmd) Run(args []string) (string, error) {
+	helpText := " this is help"
+	return helpText, nil
 }
 
+func (*HelpCmd) Help(args []string) (string, error) {
+	return "this is help of help", nil
+}
+
+
 func (*HelloCmd) Run(args []string) (string, error) {
 	/*for _, result := range args {
 		if result == "help" {
 			return "help of hello", nil
 		}
 	}*/
+
+	return "Hi, My name is Skynet 1.0. \n How can I help you ? ", nil
+}
+
+func (*HelloCmd) Help(args []string) (string, error) {
+	return "Help of Hello", nil
+}
+
+func handleCommand(command Command, args []string) string {
 	
 	if len(args) != 0 && args[0] == "help" {
 		fmt.Println("Inside 1")
-		return "help of hello", nil
+		result, err := command.Help(args)
+		if err != nil {
+			return "error"
+		}	
+		return result
 	} else if len(args) != 0 && args[0] != "help" {
-		return "unkown command", nil
+		return "Unkown command"
 	}
 
-	return "Hi, My name is Skynet 1.0. \n How can I help you ? ", nil
-}
-
-func handleCommand(command Command, args []string) string {
 	result, err := command.Run(args)
 	if err != nil {
 		return "error"