diff --git a/Iteration/Iterations.cs b/Iteration/Iterations.cs
index 28708cd..fbd089f 100644
--- a/Iteration/Iterations.cs
+++ b/Iteration/Iterations.cs
@@ -58,8 +58,17 @@ public class Iterations
         return false;
     }
 
-    public static bool FirstUpper(string s, string sub)
+    public static string FirstUpper(string s)
     {
-        return true;
+        string phrase = s;
+        string[] word = s.Split(' ');
+        string result = String.Empty;
+        foreach (var element in word)
+        {
+            string first = element.Substring(0, 1);
+            result += first.ToUpper() + element.Substring(1) + " ";
+        }
+
+        return result.TrimEnd();
     }
 }
\ No newline at end of file
diff --git a/Tests/Interatif/IterationTests.cs b/Tests/Interatif/IterationTests.cs
index 4b108db..7097d10 100644
--- a/Tests/Interatif/IterationTests.cs
+++ b/Tests/Interatif/IterationTests.cs
@@ -25,4 +25,14 @@ public class IterationTests
         bool actual = Iteration.Iterations.FindSub(s, sub);
         Assert.Equal(expected, actual);
     }
+    
+    [Theory]
+    [InlineData("Je me crois en enfer, donc j'y suis.", "Je Me Crois En Enfer, Donc J'y Suis.")]
+    [InlineData("!abc !def ghi .klm", "!abc !def Ghi .klm")]
+    
+    public void CapitalizeTest(string s, string expected)
+    {
+        string actual = Iteration.Iterations.FirstUpper(s);
+        Assert.Equal(expected, actual);
+    }
 }
\ No newline at end of file