modified the link from Day-15 to Day-16

14_Day_Component_Life_Cycles/14_component_life_cycles.md

@@ -427,7 +427,7 @@ class App extends Component {
 
   shouldComponentUpdate(nexProps, nextState) {
     console.log(nextProps, nextState)
-    // if the return is true, the application will never update.
+    // if the return is true, the application will update.
     return true
   }
 
@@ -458,6 +458,7 @@ class App extends Component {
     this.state = {
       firstName: 'John',
       day: 1,
+      congratulate: '',
     }
   }
 

15_Third_Party_Packages/15_third_party_packages.md

@@ -448,4 +448,4 @@ Try to also learn how to use the package _classnames_ and _validator_.
 
 🎉 CONGRATULATIONS ! 🎉
 
-[<< Day 14](../14_Day_Component_Life_Cycles/14_component_life_cycles.md) | [Day 16 >>]()
+[<< Day 14](../14_Day_Component_Life_Cycles/14_component_life_cycles.md) | [Day 16 >>](../16_Higher_Order_Component/16_higher_order_component.md)