diff --git a/exercises/03_if/if1.rs b/exercises/03_if/if1.rs
index 52dee0b5..e5a3c5a5 100644
--- a/exercises/03_if/if1.rs
+++ b/exercises/03_if/if1.rs
@@ -1,5 +1,5 @@
-pub fn bigger(a: i32, b: i32) -> i32 {
-    // Complete this function to return the bigger number!
+fn bigger(a: i32, b: i32) -> i32 {
+    // TODO: Complete this function to return the bigger number!
     // If both numbers are equal, any of them can be returned.
     // Do not use:
     // - another function call
diff --git a/exercises/03_if/if2.rs b/exercises/03_if/if2.rs
index a06bba55..d834ab27 100644
--- a/exercises/03_if/if2.rs
+++ b/exercises/03_if/if2.rs
@@ -1,7 +1,7 @@
 // Step 1: Make me compile!
 // Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
 
-pub fn foo_if_fizz(fizzish: &str) -> &str {
+fn foo_if_fizz(fizzish: &str) -> &str {
     if fizzish == "fizz" {
         "foo"
     } else {
diff --git a/exercises/03_if/if3.rs b/exercises/03_if/if3.rs
index 1d9b7c25..ff6fee64 100644
--- a/exercises/03_if/if3.rs
+++ b/exercises/03_if/if3.rs
@@ -1,4 +1,4 @@
-pub fn animal_habitat(animal: &str) -> &'static str {
+fn animal_habitat(animal: &str) -> &'static str {
     let identifier = if animal == "crab" {
         1
     } else if animal == "gopher" {
diff --git a/exercises/13_error_handling/errors1.rs b/exercises/13_error_handling/errors1.rs
index 15a3716d..e3e04823 100644
--- a/exercises/13_error_handling/errors1.rs
+++ b/exercises/13_error_handling/errors1.rs
@@ -8,7 +8,7 @@ fn main() {
     // You can optionally experiment here.
 }
 
-pub fn generate_nametag_text(name: String) -> Option<String> {
+fn generate_nametag_text(name: String) -> Option<String> {
     if name.is_empty() {
         // Empty names aren't allowed.
         None
diff --git a/exercises/13_error_handling/errors2.rs b/exercises/13_error_handling/errors2.rs
index e39aa959..345a0eef 100644
--- a/exercises/13_error_handling/errors2.rs
+++ b/exercises/13_error_handling/errors2.rs
@@ -16,7 +16,7 @@
 
 use std::num::ParseIntError;
 
-pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
+fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let processing_fee = 1;
     let cost_per_item = 5;
     let qty = item_quantity.parse::<i32>();
diff --git a/exercises/13_error_handling/errors3.rs b/exercises/13_error_handling/errors3.rs
index 5661f17b..2ef84f98 100644
--- a/exercises/13_error_handling/errors3.rs
+++ b/exercises/13_error_handling/errors3.rs
@@ -18,7 +18,7 @@ fn main() {
     }
 }
 
-pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
+fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let processing_fee = 1;
     let cost_per_item = 5;
     let qty = item_quantity.parse::<i32>()?;
diff --git a/exercises/14_generics/generics2.rs b/exercises/14_generics/generics2.rs
index cbb9b5f9..6cdcdaf5 100644
--- a/exercises/14_generics/generics2.rs
+++ b/exercises/14_generics/generics2.rs
@@ -6,7 +6,7 @@ struct Wrapper {
 }
 
 impl Wrapper {
-    pub fn new(value: u32) -> Self {
+    fn new(value: u32) -> Self {
         Wrapper { value }
     }
 }
diff --git a/exercises/15_traits/traits3.rs b/exercises/15_traits/traits3.rs
index 9a2365ae..66da235f 100644
--- a/exercises/15_traits/traits3.rs
+++ b/exercises/15_traits/traits3.rs
@@ -3,7 +3,7 @@
 //
 // Consider what you can add to the Licensed trait.
 
-pub trait Licensed {
+trait Licensed {
     fn licensing_info(&self) -> String;
 }
 
diff --git a/exercises/15_traits/traits4.rs b/exercises/15_traits/traits4.rs
index 7af30b57..ed63f6e1 100644
--- a/exercises/15_traits/traits4.rs
+++ b/exercises/15_traits/traits4.rs
@@ -2,7 +2,7 @@
 //
 // Don't change any line other than the marked one.
 
-pub trait Licensed {
+trait Licensed {
     fn licensing_info(&self) -> String {
         "some information".to_string()
     }
diff --git a/exercises/15_traits/traits5.rs b/exercises/15_traits/traits5.rs
index 9a45bb76..3e62283f 100644
--- a/exercises/15_traits/traits5.rs
+++ b/exercises/15_traits/traits5.rs
@@ -2,13 +2,13 @@
 //
 // Don't change any line other than the marked one.
 
-pub trait SomeTrait {
+trait SomeTrait {
     fn some_function(&self) -> bool {
         true
     }
 }
 
-pub trait OtherTrait {
+trait OtherTrait {
     fn other_function(&self) -> bool {
         true
     }
diff --git a/exercises/17_tests/tests3.rs b/exercises/17_tests/tests3.rs
index 3b4e1990..d1cb4892 100644
--- a/exercises/17_tests/tests3.rs
+++ b/exercises/17_tests/tests3.rs
@@ -2,7 +2,7 @@
 // the test passes. Then write a second test that tests whether we get the
 // result we expect to get when we call `is_even(5)`.
 
-pub fn is_even(num: i32) -> bool {
+fn is_even(num: i32) -> bool {
     num % 2 == 0
 }
 
diff --git a/exercises/17_tests/tests4.rs b/exercises/17_tests/tests4.rs
index 35a9a3b5..4303ed06 100644
--- a/exercises/17_tests/tests4.rs
+++ b/exercises/17_tests/tests4.rs
@@ -7,7 +7,7 @@ struct Rectangle {
 
 impl Rectangle {
     // Only change the test functions themselves
-    pub fn new(width: i32, height: i32) -> Self {
+    fn new(width: i32, height: i32) -> Self {
         if width <= 0 || height <= 0 {
             panic!("Rectangle width and height cannot be negative!")
         }
diff --git a/exercises/18_iterators/iterators2.rs b/exercises/18_iterators/iterators2.rs
index df1fa838..8d8909bf 100644
--- a/exercises/18_iterators/iterators2.rs
+++ b/exercises/18_iterators/iterators2.rs
@@ -4,7 +4,7 @@
 // Step 1.
 // Complete the `capitalize_first` function.
 // "hello" -> "Hello"
-pub fn capitalize_first(input: &str) -> String {
+fn capitalize_first(input: &str) -> String {
     let mut c = input.chars();
     match c.next() {
         None => String::new(),
@@ -16,7 +16,7 @@ pub fn capitalize_first(input: &str) -> String {
 // Apply the `capitalize_first` function to a slice of string slices.
 // Return a vector of strings.
 // ["hello", "world"] -> ["Hello", "World"]
-pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
+fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
     vec![]
 }
 
@@ -24,7 +24,7 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
 // Apply the `capitalize_first` function again to a slice of string slices.
 // Return a single string.
 // ["hello", " ", "world"] -> "Hello World"
-pub fn capitalize_words_string(words: &[&str]) -> String {
+fn capitalize_words_string(words: &[&str]) -> String {
     String::new()
 }
 
diff --git a/exercises/18_iterators/iterators3.rs b/exercises/18_iterators/iterators3.rs
index 9f106aa8..dfe40149 100644
--- a/exercises/18_iterators/iterators3.rs
+++ b/exercises/18_iterators/iterators3.rs
@@ -5,20 +5,20 @@
 //    list_of_results functions.
 
 #[derive(Debug, PartialEq, Eq)]
-pub enum DivisionError {
+enum DivisionError {
     NotDivisible(NotDivisibleError),
     DivideByZero,
 }
 
 #[derive(Debug, PartialEq, Eq)]
-pub struct NotDivisibleError {
+struct NotDivisibleError {
     dividend: i32,
     divisor: i32,
 }
 
 // Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
 // Otherwise, return a suitable error.
-pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
+fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
     todo!();
 }
 
diff --git a/exercises/18_iterators/iterators4.rs b/exercises/18_iterators/iterators4.rs
index 60c7b8d1..ae4d502d 100644
--- a/exercises/18_iterators/iterators4.rs
+++ b/exercises/18_iterators/iterators4.rs
@@ -1,4 +1,4 @@
-pub fn factorial(num: u64) -> u64 {
+fn factorial(num: u64) -> u64 {
     // Complete this function to return the factorial of num
     // Do not use:
     // - early returns (using the `return` keyword explicitly)
diff --git a/exercises/19_smart_pointers/box1.rs b/exercises/19_smart_pointers/box1.rs
index 226a1177..908c9232 100644
--- a/exercises/19_smart_pointers/box1.rs
+++ b/exercises/19_smart_pointers/box1.rs
@@ -15,7 +15,7 @@
 // Note: the tests should not be changed
 
 #[derive(PartialEq, Debug)]
-pub enum List {
+enum List {
     Cons(i32, List),
     Nil,
 }
@@ -28,11 +28,11 @@ fn main() {
     );
 }
 
-pub fn create_empty_list() -> List {
+fn create_empty_list() -> List {
     todo!()
 }
 
-pub fn create_non_empty_list() -> List {
+fn create_non_empty_list() -> List {
     todo!()
 }
 
diff --git a/exercises/quizzes/quiz2.rs b/exercises/quizzes/quiz2.rs
index 0a29e781..e01e3f1d 100644
--- a/exercises/quizzes/quiz2.rs
+++ b/exercises/quizzes/quiz2.rs
@@ -16,7 +16,7 @@
 //   the first element is the string, the second one is the command.
 // - The output element is going to be a Vector of strings.
 
-pub enum Command {
+enum Command {
     Uppercase,
     Trim,
     Append(usize),
diff --git a/exercises/quizzes/quiz3.rs b/exercises/quizzes/quiz3.rs
index f255cb5d..f3cb1bcf 100644
--- a/exercises/quizzes/quiz3.rs
+++ b/exercises/quizzes/quiz3.rs
@@ -12,14 +12,14 @@
 // to support alphabetical report cards. Change the Grade in the second test to
 // "A+" to show that your changes allow alphabetical grades.
 
-pub struct ReportCard {
-    pub grade: f32,
-    pub student_name: String,
-    pub student_age: u8,
+struct ReportCard {
+    grade: f32,
+    student_name: String,
+    student_age: u8,
 }
 
 impl ReportCard {
-    pub fn print(&self) -> String {
+    fn print(&self) -> String {
         format!(
             "{} ({}) - achieved a grade of {}",
             &self.student_name, &self.student_age, &self.grade