// Get the value from context variable
		String firstString = (String) context.get("firstString");
		String secondString = (String) context.get("secondString");

		//String firstString = "kitten";
		//String secondString = "sitten";
		int cost= 0;

		firstString = firstString.toLowerCase();
		secondString = secondString.toLowerCase();
		int[] costs = new int[secondString.length() + 1];
		for (int i = 0; i <= firstString.length(); i++) {
			int lastValue = i;
			for (int j = 0; j <= secondString.length(); j++) {
				if (i == 0)
					costs[j] = j;
				else {
					if (j > 0) {
						int newValue = costs[j - 1];
						if (firstString.charAt(i - 1) != secondString.charAt(j - 1))
							newValue = Math.min(Math.min(newValue, lastValue),
									costs[j]) + 1;
						costs[j - 1] = lastValue;
						lastValue = newValue;
					}
				}
			}
			if (i > 0)
			cost= costs[secondString.length()] = lastValue;
		}
		System.out.println(cost);
		context.put("Levenshtein_distance",cost);