[REFACTOR] invariant strings

Author: Gonzalo Diaz

src/algorithm_exercises_csharp/hackerrank/interview_preparation_kit/arrays/NewYearChaos.cs

@@ -43,16 +43,16 @@ public static int minimumBribesCalculate(List<int> q)
   /**
    * minimumBribes.
    */
-  public static String minimumBribesText(List<int> q)
+  public static string minimumBribesText(List<int> q)
   {
     try
     {
       int bribes = minimumBribesCalculate(q);
-      return String.Format("{0}", bribes);
+      return string.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}", bribes);
     }
     catch (InvalidOperationException e)
     {
-      return String.Format(e.Message);
+      return string.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}", e.Message);
     }
   }
 
@@ -61,6 +61,6 @@ public static String minimumBribesText(List<int> q)
    */
   public static void minimumBribes(List<int> q)
   {
-    Console.WriteLine("{0}", minimumBribesText(q));
+    Console.WriteLine(minimumBribesText(q));
   }
 }

src/algorithm_exercises_csharp_test/hackerrank/interview_preparation_kit/greedy_algorithms/LuckBalance.Test.cs

@@ -34,7 +34,8 @@ public void testLuckBalance()
       Assert.AreEqual(
         test.expected,
         result,
-        String.Format(
+        string.Format(
+          System.Globalization.CultureInfo.InvariantCulture,
           "testLuckBalance({0}, {1}) => must be: {2}",
           test.k,
           test.contests.ToString(),

src/algorithm_exercises_csharp_test/hackerrank/interview_preparation_kit/greedy_algorithms/MinimumAbsoluteDifferenceInAnArray.Test.cs

@@ -33,7 +33,8 @@ public void testMinimumAbsoluteDifferenceInAnArray()
       Assert.AreEqual(
         test.expected,
         result,
-        String.Format(
+        string.Format(
+          System.Globalization.CultureInfo.InvariantCulture,
           "minimumAbsoluteDifference({0}) => must be: {1}",
           test.input.ToString(),
           test.expected