code: def get_suggested_filename(metadata):
  	
  
  	if metadata.get('title') and metadata.get('track_number'):
  		suggested_filename = '{track_number:0>2} {title}'.format(**metadata)
  	elif metadata.get('title') and metadata.get('trackNumber'):
  		suggested_filename = '{trackNumber:0>2} {title}'.format(**metadata)
  	elif metadata.get('title') and metadata.get('tracknumber'):
  		suggested_filename = '{tracknumber:0>2} {title}'.format(**metadata)
  	else:
  		suggested_filename = '00 {}'.format(metadata.get('title', ''))
  
  	return suggested_filename
docs: Generate a filename for a song based on metadata.
  
  	Parameters:
  		metadata (dict): A metadata dict.
  
  	Returns:
  		A filename.