def transform_string_mac_address_to_mac_address(string_mac_address):
    """
    It transforms a MAC address from human readable string("00:11:22:33:44:55") to a raw string
    format("\x00\x11\x22\x33\x44\x55").
    """
    result = str()    
    for i in string_mac_address.split(':'):
        result += chr(int(i, 16))
    return result