Add filterYears method

app/src/main/java/fr/free/nrw/commons/category/CategorizationFragment.java

@@ -222,16 +222,7 @@ public class CategorizationFragment extends Fragment {
         //Needs to be an ArrayList and not a List unless we want to modify a big portion of preexisting code
         ArrayList<String> mergedItemsList = new ArrayList<String>(mergedItems);
 
-        //Copy to Iterator to prevent ConcurrentModificationException when removing item
+
-        for(Iterator<String> item = mergedItemsList.iterator(); item.hasNext();) {
-            String s = item.next();
-            
-            //Check if s contains a 4-digit word anywhere within the string (.* is wildcard)
-            if(s.matches(".*(19|20)\\d{2}.*")) {
-                Log.d(TAG, "Filtering out year " + s);
-                item.remove();
-            }
-        }
 
         Log.d(TAG, "Merged item list: " + mergedItemsList);
         return mergedItemsList;

app/src/main/java/fr/free/nrw/commons/category/PrefixUpdater.java

@@ -10,6 +10,7 @@ import org.mediawiki.api.MWApi;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Iterator;
 
 import javax.net.ssl.SSLPeerUnverifiedException;
 
@@ -41,6 +42,21 @@ public class PrefixUpdater extends AsyncTask<Void, Void, ArrayList<String>> {
         catFragment.categoriesSkip.setVisibility(View.GONE);
     }
 
+    protected ArrayList<String> filterYears(ArrayList<String> items) {
+        //Copy to Iterator to prevent ConcurrentModificationException when removing item
+        for(Iterator<String> item = items.iterator(); item.hasNext();) {
+            String s = item.next();
+
+            //Check if s contains a 4-digit word anywhere within the string (.* is wildcard)
+            if(s.matches(".*(19|20)\\d{2}.*")) {
+                Log.d(TAG, "Filtering out year " + s);
+                item.remove();
+            }
+        }
+
+        return items;
+    }
+
     @Override
     protected ArrayList<String> doInBackground(Void... voids) {
         //If user hasn't typed anything in yet, get GPS and recent items