Correct AddExtension for entry and person

entry.go

@@ -1,10 +1,10 @@
 package atomfeed
 
 import (
-	"encoding/xml"
 	"errors"
 	"fmt"
 	"strings"
+	"time"
 )
 
 // It is advisable that each atom:entry element contain a non-empty atom:title
@@ -58,8 +58,16 @@ func alternateRelExists(l []*Link) bool {
 	return false
 }
 
-func (e *Entry) AddExtension(name string, value any) {
-	e.Extensions = append(e.Extensions, &ExtensionElement{XMLName: xml.Name{Local: name}, Value: value})
+// AddExtension adds the extension to the entry
+func (e *Entry) AddExtension(x *ExtensionElement) {
+	if e.Extensions == nil {
+		e.Extensions = make([]*ExtensionElement, 1)
+		e.Extensions[0] = x
+	} else {
+		e.Extensions = append(e.Extensions, x)
+	}
+
+	e.Updated.DateTime = DateTime(time.Now())
 }
 
 func (e *Entry) Check() error {

person.go

@@ -1,7 +1,6 @@
 package atomfeed
 
 import (
-	"encoding/xml"
 	"errors"
 	"fmt"
 	"net/mail"
@@ -19,8 +18,14 @@ func NewPerson(name string) *Person {
 	return &Person{Name: name}
 }
 
-func (p *Person) AddExtension(name string, value any) {
-	p.Extensions = append(p.Extensions, &ExtensionElement{XMLName: xml.Name{Local: name}, Value: value})
+// AddExtension adds the extension to the person
+func (p *Person) AddExtension(e *ExtensionElement) {
+	if p.Extensions == nil {
+		p.Extensions = make([]*ExtensionElement, 1)
+		p.Extensions[0] = e
+	} else {
+		p.Extensions = append(p.Extensions, e)
+	}
 }
 
 func (p *Person) Check() error {