diff --git a/src/example_3/source/app.d b/src/example_3/source/app.d
index a552dfd..4dcae97 100644
--- a/src/example_3/source/app.d
+++ b/src/example_3/source/app.d
@@ -1,10 +1,5 @@
 import std.stdio;
-
-void fun(ref uint x, double y)
-{
-    x = 42;
-    y = 3.14;
-}
+import fun_;
 
 void main()
 {
diff --git a/src/example_3/source/fun.d b/src/example_3/source/fun.d
new file mode 100644
index 0000000..f19e916
--- /dev/null
+++ b/src/example_3/source/fun.d
@@ -0,0 +1,7 @@
+module fun_;
+
+void fun(ref uint x, double y)
+{
+    x = 42;
+    y = 3.14;
+}
\ No newline at end of file