code refactor

pkg/avatars/null_avatar_provider.go

@@ -0,0 +1,19 @@
+package avatars
+
+import (
+	"github.com/mayswind/ezbookkeeping/pkg/models"
+)
+
+// NullAvatarProvider represents the null avatar provider
+type NullAvatarProvider struct {
+}
+
+// NewNullAvatarProvider returns a new null avatar provider
+func NewNullAvatarProvider() *NullAvatarProvider {
+	return &NullAvatarProvider{}
+}
+
+// GetAvatarUrl returns an empty url
+func (p *NullAvatarProvider) GetAvatarUrl(user *models.User) string {
+	return ""
+}