//read file
    //skip first line -- is titles
    //next lines as string
    //establish sub strings by splitting at commas
    //transaction amount irrelevant
    //parse date

    //create list sorted by date (assumption of ordered list fails)
    //loop through list and determine if for each customer record, the previous payment falls a day back, if true, increment streak
    //multiple streaks per customer, resort to the largest for comparison
    //convert resulting hashmap to list (un-ordered)
    //sort list by streak then by account name
    //split list at n