diff --git a/04-basic-pub-sub/src/billing/Billing.csproj b/04-basic-pub-sub/src/billing/Billing.csproj
index c0dbaad7..072332ef 100644
--- a/04-basic-pub-sub/src/billing/Billing.csproj
+++ b/04-basic-pub-sub/src/billing/Billing.csproj
@@ -6,7 +6,7 @@
-
+
diff --git a/04-basic-pub-sub/src/sales/Sales.csproj b/04-basic-pub-sub/src/sales/Sales.csproj
index c0dbaad7..072332ef 100644
--- a/04-basic-pub-sub/src/sales/Sales.csproj
+++ b/04-basic-pub-sub/src/sales/Sales.csproj
@@ -6,7 +6,7 @@
-
+
diff --git a/04-basic-pub-sub/src/website/Website.csproj b/04-basic-pub-sub/src/website/Website.csproj
index c0dbaad7..072332ef 100644
--- a/04-basic-pub-sub/src/website/Website.csproj
+++ b/04-basic-pub-sub/src/website/Website.csproj
@@ -6,7 +6,7 @@
-
+