def post_process(s: str):
    """Remove unnecessary whitespace from LaTeX code.

    Args:
        s (str): Input string

    Returns:
        str: Processed image
    """
    text_reg = r'(\\(operatorname|mathrm|text|mathbf)\s?\*? {.*?})'
    letter = '[a-zA-Z]'
    noletter = '[\W_^\d]'
    names = [x[0].replace(' ', '') for x in re.findall(text_reg, s)]
    s = re.sub(text_reg, lambda match: str(names.pop(0)), s)
    news = s
    while True:
        s = news
        news = re.sub(r'(?!\\ )(%s)\s+?(%s)' % (noletter, noletter), r'\1\2', s)
        news = re.sub(r'(?!\\ )(%s)\s+?(%s)' % (noletter, letter), r'\1\2', news)
        news = re.sub(r'(%s)\s+?(%s)' % (letter, noletter), r'\1\2', news)
        if news == s:
            break
    return s
Remove unnecessary whitespace from LaTeX code.

    Args:
        s (str): Input string

    Returns:
        str: Processed image
    
pix2tex/utils/utils.py