def read_txt(fname, separator=None, **kwargs):
  """
  Read a text-file's non-zero lines and
  split them using a blank-space separator.
  
  Parameters
  ----------
  fname : str 
    Name of the file including the path
    if needed.
  separator : str
    Character separating different words.
    By default None, which effectively is
    a space (or more spaces).
  
  Returns
  -------
  content : list
    List of split lines (lists of words).
  
  """
  content = []
  
  with open(fname, 'r') as f:   
    for line in f:
      line = line.split(separator)
      if len(line) != 0:
        content.append(line)

  return content