Improve name of the model detection to allow several URL usages

To avoid the following error `huggingface_hub.utils._validators.HFValidationError: Repo id must be in the form 'repo_name' or 'namespace/repo_name'` when submitting the URL of the model repository in the following forms:
- https://huggingface.co/spaces/hf-accelerate/model-memory-usage/
- https://huggingface.co/spaces/hf-accelerate/model-memory-usage/foo

src/model_utils.py

@@ -23,8 +23,8 @@ def extract_from_url(name: str):
     if not is_url:
         return name
     else:
-        path = result.path
-        return path[1:]
+        path = result.path.split('/')
+        return '/'.join(path[1:3])
 
 
 def translate_llama2(text):