Implemented the State Pattern in data_prep.py #115
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Implemented the state pattern to help aid the methods that need to know whether or not a country was specified. There are two states, CountryGivenState and GlobalCountryState, the both implement the State interface. The Country class is the one that should be instantiated and its determines whether a country was given or not. Functions can then be called through the Country class and will be handled according to the state.