import re


def tamper(payload, **kwargs):
    """
    Add an inline comment (/**/) to the end of all occurrences of (MySQL) "information_schema" identifier

    >>> tamper('SELECT table_name FROM INFORMATION_SCHEMA.TABLES')
    'SELECT table_name FROM INFORMATION_SCHEMA/**/.TABLES'
    """

    retVal = payload

    if payload:
        retVal = re.sub(r"(?i)(information_schema)\.", r"\g<1>/**/.", payload)

    return retVal