update links (shramee#154)

exercises/arrays/README.md

@@ -7,6 +7,6 @@ This has to do with the fact that once a memory slot is written to, it cannot be
 
 ## Further information
 
-- [Arrays](https://cairo-book.github.io/ch02-06-common-collections.html#array)
+- [Arrays](https://book.cairo-lang.org/ch03-01-arrays.html)
 - [Core library](https://github.com/starkware-libs/cairo/blob/main/corelib/src/array.cairo)
 - [Cairo memory model](https://medium.com/nethermind-eth/cairo-fundamentals-stacked-up-against-evm-and-solidity-1d8d4e12b2c3#2c01)

exercises/modules/readme.md

@@ -1,6 +1,6 @@
 # Modules
 
-Modules allow creating individual scopes and organise your code better. Read about [modules in cairo book](https://cairo-book.github.io/ch06-02-defining-modules-to-control-scope.html).
+Modules allow creating individual scopes and organise your code better. Read about [modules in cairo book](https://cairo-book.github.io/ch07-02-defining-modules-to-control-scope.html).
 
 Here's some code to show modules at play,
 

exercises/structs/README.md

@@ -12,6 +12,6 @@ struct Rectangle {
 
 ## Further information
 
-- [Defining and instanciating Structs](https://cairo-book.github.io/ch04-01-defining-and-instantiating-structs.html)
-- [An example program using structs](https://cairo-book.github.io/ch04-02-an-example-program-using-structs.html)
-- [The Method syntax](https://cairo-book.github.io/ch04-03-method-syntax.html)
+- [Defining and instanciating Structs](https://cairo-book.github.io/ch05-01-defining-and-instantiating-structs.html)
+- [An example program using structs](https://cairo-book.github.io/ch05-02-an-example-program-using-structs.html)
+- [The Method syntax](https://cairo-book.github.io/ch05-03-method-syntax.html)

exercises/traits/README.md

@@ -8,4 +8,4 @@ In this way, traits are somewhat similar to Java interfaces and C++ abstract cla
 
 Because traits indicate shared behavior between data types, they are useful when writing generics.
 
-- [Traits & Impls](https://cairo-book.github.io/ch07-02-traits-in-cairo.html)
+- [Traits & Impls](https://cairo-book.github.io/ch08-02-traits-in-cairo.html)

info.toml

@@ -349,7 +349,7 @@ You'd use the struct like so,
 let john = Person { name: 'John', age: 29 };
 
 
-Read more about structs in the Structs section of this article: https://cairo-book.github.io/ch04-01-defining-and-instantiating-structs.html """
+Read more about structs in the Structs section of this article: https://cairo-book.github.io/ch05-01-defining-and-instantiating-structs.html """
 
 
 [[exercises]]
@@ -365,7 +365,7 @@ There are some shortcuts that can be taken when destructuring structs,
 let Foo {x, y} = foo; // Creates variables x and y with values foo.x and foo.y
 let Foo {x: a, y: b} = foo; // Creates variables a and b with values foo.x and foo.y
 ```
-Read more about structs in the Structs section of this article: https://cairo-book.github.io/ch04-01-defining-and-instantiating-structs.html """
+Read more about structs in the Structs section of this article: https://cairo-book.github.io/ch05-01-defining-and-instantiating-structs.html """
 
 [[exercises]]
 name = "structs3"
@@ -377,7 +377,7 @@ For is_international: What makes a package international? Seems related to the p
 For get_fees: This method takes an additional argument, is there a field in the Package struct that this relates to?
 
 Looking at the test functions will also help you understand more about the syntax.
-This section will help you understanding more about methods https://cairo-book.github.io/ch04-03-method-syntax.html
+This section will help you understanding more about methods https://cairo-book.github.io/ch05-03-method-syntax.html
 """
 
 
@@ -484,7 +484,7 @@ In the test, you need to instantiate two objects of type `Animal`.
 You can call the method of a trait by using the MyTrait::foo() syntax.
 How would you instantiate the two objects with AnimalTrait?
 Maybe you need to specify the type of the object?
-https://cairo-book.github.io/ch07-02-traits-in-cairo.html
+https://cairo-book.github.io/ch08-02-traits-in-cairo.html
 """
 
 [[exercises]]