package org.stepic.droid.storage.structure;

public class DbStructureLastStep extends DatabaseInfo {
    public static final String LAST_STEPS = "last_steps";

    public static final class Column {
        public static final String COURSE_ID = "course_id";
        public static final String UNIT_ID = "unit_id";
        public static final String STEP_ID = "step_id";
    }
}

@@ -45,16 +45,22 @@
 %0Apublic 
+final 
 class Db
@@ -81,29 +81,8 @@
 tep 
-extends DatabaseInfo 
 %7B%0A  

make dbStructureLastStep final and remove extending form base class