Completed Coding Challenge

App/Program.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Text.RegularExpressions;
+using System.Globalization;
 
 namespace App
 {
@@ -11,12 +13,39 @@ static void Main(string[] args)
 
         public static string ConvertToTitleCase(string inpStr)
         {
-            return inpStr;
+
+            if (String.IsNullOrEmpty(inpStr))
+            {
+                throw new Exception();
+            }
+            // remove non alphaNum chars
+            Regex regex = new Regex("[^a-zA-Z0-9]");
+            String outStr = regex.Replace(inpStr, " ");
+
+            //trim pre/post whitespace char
+            char[] trimChars = { '*', ' ', '\'' };
+            outStr = outStr.Trim(trimChars);
+
+            // convert case to title
+            TextInfo locTI = new CultureInfo("en-US", false).TextInfo;
+            outStr = locTI.ToLower(outStr);
+            outStr = locTI.ToTitleCase(outStr);
+
+            return outStr;
         }
 
         public static string ConvertUnixToDateString(long? inpUnixSeconds)
         {
-            return inpUnixSeconds.ToString();
+            if (inpUnixSeconds.HasValue)// test for null
+            {
+                DateTimeOffset outDate = DateTimeOffset.FromUnixTimeSeconds(inpUnixSeconds.Value);
+                string outDateStr = outDate.ToString("MMMM d, yyyy");
+                return outDateStr;//inpUnixSeconds.ToString();
+            }
+            else
+            {
+                throw new Exception();
+            }
         }
     }
 }

AppTest/Program.Tests.cs

@@ -6,6 +6,18 @@ namespace AppTest
 {
     public class ProgramTests
     {
+        [Fact]
+        public void ConvertToTitleCase_Null()
+        {
+            // Given
+            String testStr = null;
+
+            // When
+            Action action = () => Program.ConvertToTitleCase(testStr);
+
+            // Then
+            Assert.Throws<Exception>(action);
+        }
         [Fact]
         public void ConvertToTitleCase_Simple()
         {