Terminate Intro and License activities when starting the following activities to avoid memory leaks

app/src/main/java/cy/agorise/crystalwallet/activities/IntroActivity.java

@@ -37,9 +37,6 @@ import cy.agorise.crystalwallet.views.TransactionListView;
 
 public class IntroActivity extends AppCompatActivity {
 
-    TransactionListViewModel transactionListViewModel;
-    TransactionListView transactionListView;
-
     @BindView(R.id.surface_view)
     public SurfaceView mSurfaceView;
 
@@ -96,6 +93,7 @@ public class IntroActivity extends AppCompatActivity {
                 //Intent intent = new Intent(this, CreateSeedActivity.class);
                 Intent intent = new Intent(this, BoardActivity.class);
                 startActivity(intent);
+                finish();
             }
 
         /*CrystalDatabase db = CrystalDatabase.getAppDatabase(getApplicationContext());

app/src/main/java/cy/agorise/crystalwallet/activities/LicenseActivity.java

@@ -37,6 +37,7 @@ public class LicenseActivity extends AppCompatActivity {
         if ((generalSettingLastLicenseRead != null) && (Integer.parseInt(generalSettingLastLicenseRead.getValue()) >= licenseVersion)) {
             Intent intent = new Intent(this, IntroActivity.class);
             startActivity(intent);
+            finish();
         }
     }
 
@@ -52,6 +53,7 @@ public class LicenseActivity extends AppCompatActivity {
 
         Intent intent = new Intent(this, IntroActivity.class);
         startActivity(intent);
+        finish();
     }
 
     @OnClick(R.id.btnDisAgree)