diff --git a/Iteration/Iterations.cs b/Iteration/Iterations.cs
index fbd089f..498ae5a 100644
--- a/Iteration/Iterations.cs
+++ b/Iteration/Iterations.cs
@@ -71,4 +71,12 @@ public class Iterations
 
         return result.TrimEnd();
     }
-}
\ No newline at end of file
+
+    public static string ReplaceChar(string source, char toReplace, char replace)
+    {
+        string result = string.Empty;
+        result = source.Replace(toReplace, replace);
+
+        return result;
+    }
+}
diff --git a/Tests/Interatif/IterationTests.cs b/Tests/Interatif/IterationTests.cs
index 7097d10..dbda1c8 100644
--- a/Tests/Interatif/IterationTests.cs
+++ b/Tests/Interatif/IterationTests.cs
@@ -35,4 +35,14 @@ public class IterationTests
         string actual = Iteration.Iterations.FirstUpper(s);
         Assert.Equal(expected, actual);
     }
+    
+    [Theory]
+    [InlineData("De la programmation avant toute chose.", 'a', '*', "De l* progr*mm*tion *v*nt toute chose.")]
+    [InlineData("De la programmation avant toute chose.", 'a', '!', "De l! progr!mm!tion !v!nt toute chose.")]
+    
+    public void ReplaceTest(string s, char old, char next, string expected)
+    {
+        string actual = Iteration.Iterations.ReplaceChar(s, old, next);
+        Assert.Equal(expected, actual);
+    }
 }
\ No newline at end of file