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public static void solveUseCase4(List<MatchesData> matches, List<DeliveriesData> deliveries) {
        Map<String, Double> topEconomyOfBowlers = new HashMap<>();
        Map<String, Integer> runsConcededPerBowler = new HashMap<>();
        Map<String, Integer> ballsPerBowler = new HashMap<>();

        for (DeliveriesData delivery : deliveries) {
            if (isDeliveryIn2015(matches, delivery.getMatchId())) {
                int balls = ballsPerBowler.getOrDefault(delivery.getBowler(), 0) + 1;
                ballsPerBowler.put(delivery.getBowler(), balls);

                int totalRuns = Integer.parseInt(delivery.getTotalRuns());
                int legByeRuns = Integer.parseInt(delivery.getLegByeRuns());

                // removing legBye runs  since these shouldn't affect bowlers economy
                int runs = runsConcededPerBowler.getOrDefault(delivery.getBowler(), 0) + (totalRuns - legByeRuns);
                runsConcededPerBowler.put(delivery.getBowler(), runs);
            }
        }

        for (String bowler : ballsPerBowler.keySet()) {
            int balls = ballsPerBowler.get(bowler);
            int runs = runsConcededPerBowler.get(bowler);
            double oversCount = balls / 6.0;
            double economyRate = runs / oversCount;
            topEconomyOfBowlers.put(bowler, economyRate);
        }

        Set<Map.Entry<String, Double>> entrySet = topEconomyOfBowlers.entrySet();
        List<Map.Entry<String, Double>> sortedList = new ArrayList<>(entrySet);
        sortedList.sort(Map.Entry.comparingByValue());

        System.out.println(sortedList);
        //for(Map.Entry<String, Double> entry : sortedList)
    }

    private static boolean isDeliveryIn2015(List<MatchesData> matches, String matchId) {
        for (MatchesData match : matches) {
            if (match.getId().equals(matchId) && match.getSeason().equals("2015")) {
                return true;
            }
        }
        return false;
    }





 Solutions.solveUseCase4(new ArrayList<>(matchDict.values()), deliveriesList);