Removed char to avoid git submodules

src/main/java/at/ac/uibk/gitsearch/service/ExerciseService.java

@@ -217,7 +217,7 @@ public class ExerciseService {
 
         // https://www.baeldung.com/java-compress-and-uncompress
         while ((zipEntry = zipInputStream.getNextEntry()) != null) {
-            if (zipEntry.getName().contains("/.git/")) {    // important as Artemis exercises come in submodules
+            if (zipEntry.getName().contains(".git")) {    // important as Artemis exercises come in submodules
                 continue;
             }
             File entryFile = new File(tmpDir, zipEntry.getName());