No resources for Billion Dollar Mistake

Author: arialdomartini

README.md

@@ -297,8 +297,7 @@ Active-Record is the design pattern that promotes objects to include functions s
 Data-Mapper is a design pattern that promotes the use of a layer of Mappers that moves data between objects and a database while keeping them independent of each other and the mapper itself. On the contrary, in Active-Record objects directly incorporate operations for persisting themselves to a database, and properties corresponding to the underlying database tables. Do you have an opinion on those patterns? When would you use one instead of the other?
 
 #### Billion Dollar Mistake
-Why is it often said that the introduction of `null` is a "billion dollar mistake"? Would you discuss the techniques to avoid it, such as the Null Object Pattern introduced by the GOF book, or Option types?<br/>
-[Resources](design-patterns/billion-dollar-mistake.md)
+Why is it often said that the introduction of `null` is a "billion dollar mistake"? Would you discuss the techniques to avoid it, such as the Null Object Pattern introduced by the GOF book, or Option types?
 
 #### Inheritance vs Composition
 Many state that, in Object-Oriented Programming, composition is often a better option than inheritance. What's you opinion?<br/>