import re

COMMON_SUFFIXES = {
    "co., ltd.", "co.,ltd.", "co. ltd.", "ltd.", "inc.",
    "corp.", "corporation", "co.", "llc", "plc", "gmbh",
    "주식회사", "(주)", "(사)", "유한회사",
    "株式会社", "有限会社", "合同会社",
}

def normalize_name(name: str) -> str:
    name = name.lower().strip()
    name = re.sub(r'[^ws]', '', name)
    name = re.sub(r's+', ' ', name)
    for suffix in sorted(COMMON_SUFFIXES, key=len, reverse=True):
        if name.endswith(suffix):
            name = name[:-len(suffix)].strip()
    return name