import re


def preprocess_remove_line_break(raw_text, replacements=""):
    # 移除单独换行符
    pattern = r"(?<!\n)\n(?!\n)"
    text_content = re.sub(pattern, replacements, raw_text)
    text_content = text_content.replace("“", "\"")
    text_content = text_content.replace("”", "\"")
    text_content = text_content.replace("‘", "'")
    text_content = text_content.replace("’", "'")
    
    return text_content