Clean up and unify exercises

exercises/15_traits/traits1.rs

@@ -1,11 +1,6 @@
-// traits1.rs
-//
 // Time to implement some traits! Your task is to implement the trait
 // `AppendBar` for the type `String`. The trait AppendBar has only one function,
 // which appends "Bar" to any object implementing this trait.
-//
-// Execute `rustlings hint traits1` or use the `hint` watch subcommand for a
-// hint.
 
 trait AppendBar {
     fn append_bar(self) -> Self;

exercises/15_traits/traits2.rs

@@ -1,12 +1,8 @@
-// traits2.rs
-//
 // Your task is to implement the trait `AppendBar` for a vector of strings. To
 // implement this trait, consider for a moment what it means to 'append "Bar"'
 // to a vector of strings.
 //
 // No boiler plate code this time, you can do this!
-//
-// Execute `rustlings hint traits2` or use the `hint` watch subcommand for a hint.
 
 trait AppendBar {
     fn append_bar(self) -> Self;

exercises/15_traits/traits3.rs

@@ -1,12 +1,7 @@
-// traits3.rs
-//
 // Your task is to implement the Licensed trait for both structures and have
 // them return the same information without writing the same function twice.
 //
 // Consider what you can add to the Licensed trait.
-//
-// Execute `rustlings hint traits3` or use the `hint` watch subcommand for a
-// hint.
 
 pub trait Licensed {
     fn licensing_info(&self) -> String;

exercises/15_traits/traits4.rs

@@ -1,11 +1,6 @@
-// traits4.rs
-//
 // Your task is to replace the '??' sections so the code compiles.
 //
 // Don't change any line other than the marked one.
-//
-// Execute `rustlings hint traits4` or use the `hint` watch subcommand for a
-// hint.
 
 pub trait Licensed {
     fn licensing_info(&self) -> String {

exercises/15_traits/traits5.rs

@@ -1,11 +1,6 @@
-// traits5.rs
-//
 // Your task is to replace the '??' sections so the code compiles.
 //
 // Don't change any line other than the marked one.
-//
-// Execute `rustlings hint traits5` or use the `hint` watch subcommand for a
-// hint.
 
 pub trait SomeTrait {
     fn some_function(&self) -> bool {