diff --git a/concatenation.c b/concatenation.c
--- a/concatenation.c
+++ b/concatenation.c
@@ -46,6 +46,7 @@
 int main (int argc, char **argv)
 {
     Person person[5];
+
     int i;
 
     set_Person (&person[0], "Breitkopf", "Manuela", "Maxim-Gorki-Strasse 49", 18106, "Rostock");