chore: Removed extra whitespaces

Co-authored-by: Corentin ARNOULD <corentin.arn@gmail.com>

info.toml

@@ -52,7 +52,7 @@ because we want to assign a different typed value to an existing variable. Somet
 you may also like to reuse existing variable names because you are just converting
 values to different types like in this exercise.
 Fortunately Rust has a powerful solution to this problem: 'Shadowing'!
-You can read more about 'Shadowing' in the book's section 'Variables and Mutability': 
+You can read more about 'Shadowing' in the book's section 'Variables and Mutability':
 https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html#shadowing
 Try to solve this exercise afterwards using this technique."""
 
@@ -61,13 +61,13 @@ name = "variables6"
 path = "exercises/variables/variables6.rs"
 mode = "compile"
 hint = """
-We know about variables and mutability, but there is another important type of 
-variable available; constants. 
-Constants are always immutable and they are declared with keyword 'const' rather 
+We know about variables and mutability, but there is another important type of
+variable available; constants.
+Constants are always immutable and they are declared with keyword 'const' rather
 than keyword 'let'.
 Constants types must also always be annotated.
 
-Read more about constants under 'Differences Between Variables and Constants' in the book's section 'Variables and Mutability': 
+Read more about constants under 'Differences Between Variables and Constants' in the book's section 'Variables and Mutability':
 https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html#differences-between-variables-and-constants
 """
 
@@ -237,8 +237,8 @@ name = "structs2"
 path = "exercises/structs/structs2.rs"
 mode = "test"
 hint = """
-Creating instances of structs is easy, all you need to do is assign some values to its fields. 
-There is however some shortcuts that can be taken when instantiating structs. 
+Creating instances of structs is easy, all you need to do is assign some values to its fields.
+There is however some shortcuts that can be taken when instantiating structs.
 Have a look in The Book, to find out more: https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html#creating-instances-from-other-instances-with-struct-update-syntax"""
 
 [[exercises]]
@@ -682,8 +682,8 @@ name = "iterators4"
 path = "exercises/standard_library_types/iterators4.rs"
 mode = "test"
 hint = """
-In an imperative language, you might write a for loop that updates 
-a mutable variable. Or, you might write code utilizing recursion 
+In an imperative language, you might write a for loop that updates
+a mutable variable. Or, you might write code utilizing recursion
 and a match clause. In Rust you can take another functional
 approach, computing the factorial elegantly with ranges and iterators."""
 
@@ -703,10 +703,10 @@ name = "traits2"
 path = "exercises/traits/traits2.rs"
 mode = "test"
 hint = """
-Notice how the trait takes ownership of 'self',and returns `Self'. 
+Notice how the trait takes ownership of 'self',and returns `Self'.
 Try mutating the incoming string vector.
 
-Vectors provide suitable methods for adding an element at the end. See 
+Vectors provide suitable methods for adding an element at the end. See
 the documentation at: https://doc.rust-lang.org/std/vec/struct.Vec.html"""
 
 # Generics
@@ -724,7 +724,7 @@ name = "generics2"
 path = "exercises/generics/generics2.rs"
 mode = "test"
 hint = """
-Currently we are wrapping only values of type 'u32'. 
+Currently we are wrapping only values of type 'u32'.
 Maybe we could update the explicit references to this data type somehow?
 
 If you are still stuck https://doc.rust-lang.org/stable/book/ch10-01-syntax.html#in-method-definitions
@@ -735,7 +735,7 @@ name = "generics3"
 path = "exercises/generics/generics3.rs"
 mode = "test"
 hint = """
-To find the best solution to this challenge you're going to need to think back to your 
+To find the best solution to this challenge you're going to need to think back to your
 knowledge of traits, specifically Trait Bound Syntax -  you may also need this: "use std::fmt::Display;"
 
 This is definitely harder than the last two exercises! You need to think about not only making the