*Five features (addrline1, addrline2, city, country, postcode) in the table contain address information.
*Features addrline1, addrline2 and city are not cleaned. They have city, country and postcode information.
*The first object of this project is to extract citypostcode, country state and postcode city information from the three features above.*Then, we clean the postcode, state and city information to generate postcode_cleaned, state_cleaned and city_cleaned.
*By now, we only focus on cleaning American patents.