This appears to be a separate repository. The task is asking to generate a patch for the django/django repository, not a file in this current directory. Based on the problem statement, I have all the information needed to create the patch:

The issue is in `django/core/management/templates.py` at line 77, where `os.path.basename(target)` is called without handling trailing slashes. The fix is to strip trailing slashes before calling `basename()`.

Here's the patch:

--- a/django/core/management/templates.py
+++ b/django/core/management/templates.py
@@ -74,7 +74,7 @@ class TemplateCommand(BaseCommand):
             raise CommandError(e)
         else:
             if app_or_project == 'app':
-                self.validate_name(os.path.basename(target), 'directory')
+                self.validate_name(os.path.basename(target.rstrip(os.sep)), 'directory')
             top_dir = os.path.abspath(os.path.expanduser(target))
             if not os.path.exists(top_dir):
                 raise CommandError("Destination directory '%s' does not "