Make methods static where possible

src/main/java/at/ac/uibk/gitsearch/repository/search/MetaDataRepository.java

@@ -195,7 +195,7 @@ public class MetaDataRepository {
 		}
 	}
 
-	private void addTo(Map<String, Map<String, Integer>> completionMap, List<String> tokenList, String target) {
+	private static void addTo(Map<String, Map<String, Integer>> completionMap, List<String> tokenList, String target) {
 		tokenList.forEach(token -> {
 			Map<String, Integer> existingTargets = completionMap.get(token);
 			if (existingTargets == null) { // none found
@@ -299,7 +299,7 @@ public class MetaDataRepository {
     }
 
 	/** Helper **/
-	private void forEachTerm(String searchTerm, Consumer<String> exec) {
+	private static void forEachTerm(String searchTerm, Consumer<String> exec) {
 		if (searchTerm == null)
 			return;
 		StringTokenizer st = new StringTokenizer(searchTerm);