Fixed the link to the second edition book

README.md

@@ -75,7 +75,7 @@ Seminars
         About the course. Scheduling further seminars. Introduction to the Rust [ecosystem](doc/Ecosystem.md), and basics of Rust programming.
 
 
-        We will cover the Rust book [Rustbook Second Edition](https://doc.rust-lang.org/book/second-edition.html) sections 
+        We will cover the Rust book [Rustbook Second Edition](https://doc.rust-lang.org/book/second-edition/) sections 
 
         * [1 - Introduction](https://doc.rust-lang.org/book/second-edition/ch01-00-introduction.html), 
         * [2 - Guessing Game Tutorial](https://doc.rust-lang.org/book/second-edition/ch02-00-guessing-game-tutorial.html), and 
@@ -103,7 +103,7 @@ Seminars
         Using the Rust ownership model.
         Data structures, structs, enums, String (relation to slices) etc. Containers, Vec,  and HashSets/Maps. Iterators. Using the Rust module system. Handling errors.
 
-        We will cover the Rust book [Rustbook Second Edition](https://doc.rust-lang.org/book/second-edition.html) sections 
+        We will cover the Rust book [Rustbook Second Edition](https://doc.rust-lang.org/book/second-edition/) sections 
 
         * [4 - Understanding Ownership](https://doc.rust-lang.org/book/second-edition/ch04-00-understanding-ownership.html), 
         * [5 - Using Structs to Structure Related Data](https://doc.rust-lang.org/book/second-edition/ch05-00-structs.html),