Removed unnecessary folder on temp Zip creation

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

@@ -217,7 +217,7 @@ public class ExerciseService {
     }
 
     /**
-     * Used to temporary store content of Zip-File into a tmp-subdirectory
+     * Used to temporary store content of Artemis' exercises Zip-Files into a tmp-subdirectory
      *
      * Recursion is used in case of nested Zip-Files
      *
@@ -246,7 +246,7 @@ public class ExerciseService {
                 writeFile(zipEntryPath.toFile(), zipInputStream);
                 String newSubDir;
                 if (StringUtils.endsWithAny(zipEntry.getName(), new String[] { "-exercise.zip", "-solution.zip", "-tests.zip" })) {
-                    newSubDir = Paths.get(targetDir.toString(), getRepoNameFromZipEntry(zipEntry)).toString();
+                    newSubDir = Paths.get(targetDir.getParent().toString(), getRepoNameFromZipEntry(zipEntry)).toString();
                 } else {
                     newSubDir =
                         Paths.get(targetDir.toString(), zipEntry.getName().substring(0, zipEntry.getName().lastIndexOf("."))).toString();