Name 'multiply_optimized' is not defined

Hello! I submitted Assignment 3 - Divide and Conquer Practice(id: 69163) but getting error “name ‘multiply_optimized’ is not defined” and can’t understand why because I defined it.

This 4 lines are also running:
project=‘python-divide-and-conquer-assignment’
!pip install jovian --upgrade --quiet
import jovian
jovian.commit(project=project, privacy=‘secret’, environment=None)

Notebook: