def add_value_prefix(records, prefix_dict):
    """
    Prefixes a record value
    :param records: list - List of record dicts
    :param prefix_dict: dict - Dict of columns and prefixes to add to values
    """
    for record in records:
        for prefix_key, prefix_value in prefix_dict.items():
            if prefix_key in record.keys():
                record[prefix_key] = prefix_value + str(record[prefix_key])
    return records