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    /**
     * Write a spell checker function
     * The function uses a dictionary on file "dictoinary.txt" and returns true or false if an input string is part of the dictionary or not.
     * The words in the dictionary are separated by \n (one words per line)
     * 
     * example of dictionary.txt:
     * 
     * apple
     * orange
     * bananas
     * fire
     * firefighter
     * 
     * Suppose, for thet sake of this exercise, that the function's input is an array:
     * dictionary = ["apple", "orange", "bananas", "fire", "firefighter"]
     * 
     * Unsorted
     * 
     * Follow-up: implement a prefix checker
     * a -> true
     * ap -> true
     * apple -> true
     * apples -> false
     * "" -> false
     * 
     */