code: def _find_from_file(full_doc, from_file_keyword):
      
      path = None
  
      for line in full_doc.splitlines():
          if from_file_keyword in line:
              parts = line.strip().split(':')
              if len(parts) == 2 and parts[0].strip() == from_file_keyword:
                  path = parts[1].strip()
                  break
  
      return path
docs: Finds a line in <full_doc> like
  
          <from_file_keyword> <colon> <path>
  
      and return path