chore: Removed extra whitespaces

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

exercises/enums/README.md

@@ -1,8 +1,8 @@
 ### Enums
 
-Rust allows you to define types called "enums" which enumerate possible values. 
+Rust allows you to define types called "enums" which enumerate possible values.
 Enums are a feature in many languages, but their capabilities differ in each language. Rust’s enums are most similar to algebraic data types in functional languages, such as F#, OCaml, and Haskell.
-Useful in combination with enums is Rust's "pattern matching" facility, which makes it easy to run different code for different values of an enumeration.  
+Useful in combination with enums is Rust's "pattern matching" facility, which makes it easy to run different code for different values of an enumeration.
 
 #### Book Sections
 

exercises/error_handling/README.md

@@ -1,5 +1,5 @@
 For this exercise check out the sections:
-- [Error Handling](https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html) 
-- [Generics](https://doc.rust-lang.org/book/ch10-01-syntax.html) 
+- [Error Handling](https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html)
+- [Generics](https://doc.rust-lang.org/book/ch10-01-syntax.html)
 
 of the Rust Book.

exercises/generics/generics3.rs

@@ -4,8 +4,8 @@
 // However, the school also issues alphabetical grades (A+ -> F-) and needs
 // to be able to print both types of report card!
 
-// Make the necessary code changes in the struct ReportCard and the impl block 
-// to support alphabetical report cards. Change the Grade in the second test to "A+" 
+// Make the necessary code changes in the struct ReportCard and the impl block
+// to support alphabetical report cards. Change the Grade in the second test to "A+"
 // to show that your changes allow alphabetical grades.
 
 // Execute 'rustlings hint generics3' for hints!

exercises/traits/README.md

@@ -1,6 +1,6 @@
 ### Traits
 
-A trait is a collection of methods. 
+A trait is a collection of methods.
 
 Data types can implement traits. To do so, the methods making up the trait are defined for the data type. For example, the `String` data type implements the `From<&str>` trait. This allows a user to write `String::from("hello")`.
 
@@ -8,7 +8,7 @@ In this way, traits are somewhat similar to Java interfaces and C++ abstract cla
 
 Some additional common Rust traits include:
 
-+ `Clone` (the `clone` method), 
++ `Clone` (the `clone` method),
 + `Display` (which allows formatted display via `{}`), and
 + `Debug` (which allows formatted display via `{:?}`).
 
@@ -17,4 +17,4 @@ Because traits indicate shared behavior between data types, they are useful when
 
 #### Book Sections
 
-- [Traits](https://doc.rust-lang.org/book/ch10-02-traits.html)
+- [Traits](https://doc.rust-lang.org/book/ch10-02-traits.html)