Social Auth Google removes spaces when importing Google account name

Problem/Motivation

When a user logs in via Social Auth Google, the module automatically generates the Drupal username based on the Google account name. However, all spaces are removed.
For example:

1. Google account name: Dao Duc Trung
2. Generated Drupal username: daoductrung

This behavior is unexpected.
Expected behavior:
The full name from the Google account should be preserved, including spaces, because Drupal usernames allow spaces by default.
So in the example above, the username should be:
Dao Duc Trung