code: def JoinKeyPath(path_segments):
    
    # This is an optimized way to combine the path segments into a single path
    # and combine multiple successive path separators to one.
  
    # Split all the path segments based on the path (segment) separator.
    path_segments = [
        segment.split(definitions.KEY_PATH_SEPARATOR)
        for segment in path_segments]
  
    # Flatten the sublists into one list.
    path_segments = [
        element for sublist in path_segments for element in sublist]
  
    # Remove empty path segments.
    path_segments = filter(None, path_segments)
  
    key_path = definitions.KEY_PATH_SEPARATOR.join(path_segments)
    if not key_path.startswith('HKEY_'):
      key_path = '{0:s}{1:s}'.format(definitions.KEY_PATH_SEPARATOR, key_path)
    return key_path
docs: Joins the path segments into key path.
  
    Args:
      path_segments (list[str]): Windows Registry key path segments.
  
    Returns:
      str: key path.