def extract(filename):
    """
    extract portion of ETL
     - In this case it is simply a local tab separated file
     - This file path is given as an input
     - Copy records from the file into a list and returns it
    """
    raw_rows = []
    with open(filename) as f:
        for line in f:
            raw_rows.append(line.rstrip())
    return raw_rows