diff --git a/dev-Cargo.toml b/dev-Cargo.toml
index 9230c2e948..4f725b704b 120000
--- a/dev-Cargo.toml
+++ b/dev-Cargo.toml
@@ -1 +1,223 @@
-dev/Cargo.toml
\ No newline at end of file
+# Don't edit the `bin` list manually! It is updated by `cargo dev update`. This comment line will be stripped in `rustlings init`.
+bin = [
+  { name = "intro1", path = "../exercises/00_intro/intro1.rs" },
+  { name = "intro1_sol", path = "../solutions/00_intro/intro1.rs" },
+  { name = "intro2", path = "../exercises/00_intro/intro2.rs" },
+  { name = "intro2_sol", path = "../solutions/00_intro/intro2.rs" },
+  { name = "variables1", path = "../exercises/01_variables/variables1.rs" },
+  { name = "variables1_sol", path = "../solutions/01_variables/variables1.rs" },
+  { name = "variables2", path = "../exercises/01_variables/variables2.rs" },
+  { name = "variables2_sol", path = "../solutions/01_variables/variables2.rs" },
+  { name = "variables3", path = "../exercises/01_variables/variables3.rs" },
+  { name = "variables3_sol", path = "../solutions/01_variables/variables3.rs" },
+  { name = "variables4", path = "../exercises/01_variables/variables4.rs" },
+  { name = "variables4_sol", path = "../solutions/01_variables/variables4.rs" },
+  { name = "variables5", path = "../exercises/01_variables/variables5.rs" },
+  { name = "variables5_sol", path = "../solutions/01_variables/variables5.rs" },
+  { name = "variables6", path = "../exercises/01_variables/variables6.rs" },
+  { name = "variables6_sol", path = "../solutions/01_variables/variables6.rs" },
+  { name = "functions1", path = "../exercises/02_functions/functions1.rs" },
+  { name = "functions1_sol", path = "../solutions/02_functions/functions1.rs" },
+  { name = "functions2", path = "../exercises/02_functions/functions2.rs" },
+  { name = "functions2_sol", path = "../solutions/02_functions/functions2.rs" },
+  { name = "functions3", path = "../exercises/02_functions/functions3.rs" },
+  { name = "functions3_sol", path = "../solutions/02_functions/functions3.rs" },
+  { name = "functions4", path = "../exercises/02_functions/functions4.rs" },
+  { name = "functions4_sol", path = "../solutions/02_functions/functions4.rs" },
+  { name = "functions5", path = "../exercises/02_functions/functions5.rs" },
+  { name = "functions5_sol", path = "../solutions/02_functions/functions5.rs" },
+  { name = "if1", path = "../exercises/03_if/if1.rs" },
+  { name = "if1_sol", path = "../solutions/03_if/if1.rs" },
+  { name = "if2", path = "../exercises/03_if/if2.rs" },
+  { name = "if2_sol", path = "../solutions/03_if/if2.rs" },
+  { name = "if3", path = "../exercises/03_if/if3.rs" },
+  { name = "if3_sol", path = "../solutions/03_if/if3.rs" },
+  { name = "quiz1", path = "../exercises/quizzes/quiz1.rs" },
+  { name = "quiz1_sol", path = "../solutions/quizzes/quiz1.rs" },
+  { name = "primitive_types1", path = "../exercises/04_primitive_types/primitive_types1.rs" },
+  { name = "primitive_types1_sol", path = "../solutions/04_primitive_types/primitive_types1.rs" },
+  { name = "primitive_types2", path = "../exercises/04_primitive_types/primitive_types2.rs" },
+  { name = "primitive_types2_sol", path = "../solutions/04_primitive_types/primitive_types2.rs" },
+  { name = "primitive_types3", path = "../exercises/04_primitive_types/primitive_types3.rs" },
+  { name = "primitive_types3_sol", path = "../solutions/04_primitive_types/primitive_types3.rs" },
+  { name = "primitive_types4", path = "../exercises/04_primitive_types/primitive_types4.rs" },
+  { name = "primitive_types4_sol", path = "../solutions/04_primitive_types/primitive_types4.rs" },
+  { name = "primitive_types5", path = "../exercises/04_primitive_types/primitive_types5.rs" },
+  { name = "primitive_types5_sol", path = "../solutions/04_primitive_types/primitive_types5.rs" },
+  { name = "primitive_types6", path = "../exercises/04_primitive_types/primitive_types6.rs" },
+  { name = "primitive_types6_sol", path = "../solutions/04_primitive_types/primitive_types6.rs" },
+  { name = "vecs1", path = "../exercises/05_vecs/vecs1.rs" },
+  { name = "vecs1_sol", path = "../solutions/05_vecs/vecs1.rs" },
+  { name = "vecs2", path = "../exercises/05_vecs/vecs2.rs" },
+  { name = "vecs2_sol", path = "../solutions/05_vecs/vecs2.rs" },
+  { name = "move_semantics1", path = "../exercises/06_move_semantics/move_semantics1.rs" },
+  { name = "move_semantics1_sol", path = "../solutions/06_move_semantics/move_semantics1.rs" },
+  { name = "move_semantics2", path = "../exercises/06_move_semantics/move_semantics2.rs" },
+  { name = "move_semantics2_sol", path = "../solutions/06_move_semantics/move_semantics2.rs" },
+  { name = "move_semantics3", path = "../exercises/06_move_semantics/move_semantics3.rs" },
+  { name = "move_semantics3_sol", path = "../solutions/06_move_semantics/move_semantics3.rs" },
+  { name = "move_semantics4", path = "../exercises/06_move_semantics/move_semantics4.rs" },
+  { name = "move_semantics4_sol", path = "../solutions/06_move_semantics/move_semantics4.rs" },
+  { name = "move_semantics5", path = "../exercises/06_move_semantics/move_semantics5.rs" },
+  { name = "move_semantics5_sol", path = "../solutions/06_move_semantics/move_semantics5.rs" },
+  { name = "structs1", path = "../exercises/07_structs/structs1.rs" },
+  { name = "structs1_sol", path = "../solutions/07_structs/structs1.rs" },
+  { name = "structs2", path = "../exercises/07_structs/structs2.rs" },
+  { name = "structs2_sol", path = "../solutions/07_structs/structs2.rs" },
+  { name = "structs3", path = "../exercises/07_structs/structs3.rs" },
+  { name = "structs3_sol", path = "../solutions/07_structs/structs3.rs" },
+  { name = "enums1", path = "../exercises/08_enums/enums1.rs" },
+  { name = "enums1_sol", path = "../solutions/08_enums/enums1.rs" },
+  { name = "enums2", path = "../exercises/08_enums/enums2.rs" },
+  { name = "enums2_sol", path = "../solutions/08_enums/enums2.rs" },
+  { name = "enums3", path = "../exercises/08_enums/enums3.rs" },
+  { name = "enums3_sol", path = "../solutions/08_enums/enums3.rs" },
+  { name = "strings1", path = "../exercises/09_strings/strings1.rs" },
+  { name = "strings1_sol", path = "../solutions/09_strings/strings1.rs" },
+  { name = "strings2", path = "../exercises/09_strings/strings2.rs" },
+  { name = "strings2_sol", path = "../solutions/09_strings/strings2.rs" },
+  { name = "strings3", path = "../exercises/09_strings/strings3.rs" },
+  { name = "strings3_sol", path = "../solutions/09_strings/strings3.rs" },
+  { name = "strings4", path = "../exercises/09_strings/strings4.rs" },
+  { name = "strings4_sol", path = "../solutions/09_strings/strings4.rs" },
+  { name = "modules1", path = "../exercises/10_modules/modules1.rs" },
+  { name = "modules1_sol", path = "../solutions/10_modules/modules1.rs" },
+  { name = "modules2", path = "../exercises/10_modules/modules2.rs" },
+  { name = "modules2_sol", path = "../solutions/10_modules/modules2.rs" },
+  { name = "modules3", path = "../exercises/10_modules/modules3.rs" },
+  { name = "modules3_sol", path = "../solutions/10_modules/modules3.rs" },
+  { name = "hashmaps1", path = "../exercises/11_hashmaps/hashmaps1.rs" },
+  { name = "hashmaps1_sol", path = "../solutions/11_hashmaps/hashmaps1.rs" },
+  { name = "hashmaps2", path = "../exercises/11_hashmaps/hashmaps2.rs" },
+  { name = "hashmaps2_sol", path = "../solutions/11_hashmaps/hashmaps2.rs" },
+  { name = "hashmaps3", path = "../exercises/11_hashmaps/hashmaps3.rs" },
+  { name = "hashmaps3_sol", path = "../solutions/11_hashmaps/hashmaps3.rs" },
+  { name = "quiz2", path = "../exercises/quizzes/quiz2.rs" },
+  { name = "quiz2_sol", path = "../solutions/quizzes/quiz2.rs" },
+  { name = "options1", path = "../exercises/12_options/options1.rs" },
+  { name = "options1_sol", path = "../solutions/12_options/options1.rs" },
+  { name = "options2", path = "../exercises/12_options/options2.rs" },
+  { name = "options2_sol", path = "../solutions/12_options/options2.rs" },
+  { name = "options3", path = "../exercises/12_options/options3.rs" },
+  { name = "options3_sol", path = "../solutions/12_options/options3.rs" },
+  { name = "errors1", path = "../exercises/13_error_handling/errors1.rs" },
+  { name = "errors1_sol", path = "../solutions/13_error_handling/errors1.rs" },
+  { name = "errors2", path = "../exercises/13_error_handling/errors2.rs" },
+  { name = "errors2_sol", path = "../solutions/13_error_handling/errors2.rs" },
+  { name = "errors3", path = "../exercises/13_error_handling/errors3.rs" },
+  { name = "errors3_sol", path = "../solutions/13_error_handling/errors3.rs" },
+  { name = "errors4", path = "../exercises/13_error_handling/errors4.rs" },
+  { name = "errors4_sol", path = "../solutions/13_error_handling/errors4.rs" },
+  { name = "errors5", path = "../exercises/13_error_handling/errors5.rs" },
+  { name = "errors5_sol", path = "../solutions/13_error_handling/errors5.rs" },
+  { name = "errors6", path = "../exercises/13_error_handling/errors6.rs" },
+  { name = "errors6_sol", path = "../solutions/13_error_handling/errors6.rs" },
+  { name = "generics1", path = "../exercises/14_generics/generics1.rs" },
+  { name = "generics1_sol", path = "../solutions/14_generics/generics1.rs" },
+  { name = "generics2", path = "../exercises/14_generics/generics2.rs" },
+  { name = "generics2_sol", path = "../solutions/14_generics/generics2.rs" },
+  { name = "traits1", path = "../exercises/15_traits/traits1.rs" },
+  { name = "traits1_sol", path = "../solutions/15_traits/traits1.rs" },
+  { name = "traits2", path = "../exercises/15_traits/traits2.rs" },
+  { name = "traits2_sol", path = "../solutions/15_traits/traits2.rs" },
+  { name = "traits3", path = "../exercises/15_traits/traits3.rs" },
+  { name = "traits3_sol", path = "../solutions/15_traits/traits3.rs" },
+  { name = "traits4", path = "../exercises/15_traits/traits4.rs" },
+  { name = "traits4_sol", path = "../solutions/15_traits/traits4.rs" },
+  { name = "traits5", path = "../exercises/15_traits/traits5.rs" },
+  { name = "traits5_sol", path = "../solutions/15_traits/traits5.rs" },
+  { name = "quiz3", path = "../exercises/quizzes/quiz3.rs" },
+  { name = "quiz3_sol", path = "../solutions/quizzes/quiz3.rs" },
+  { name = "lifetimes1", path = "../exercises/16_lifetimes/lifetimes1.rs" },
+  { name = "lifetimes1_sol", path = "../solutions/16_lifetimes/lifetimes1.rs" },
+  { name = "lifetimes2", path = "../exercises/16_lifetimes/lifetimes2.rs" },
+  { name = "lifetimes2_sol", path = "../solutions/16_lifetimes/lifetimes2.rs" },
+  { name = "lifetimes3", path = "../exercises/16_lifetimes/lifetimes3.rs" },
+  { name = "lifetimes3_sol", path = "../solutions/16_lifetimes/lifetimes3.rs" },
+  { name = "tests1", path = "../exercises/17_tests/tests1.rs" },
+  { name = "tests1_sol", path = "../solutions/17_tests/tests1.rs" },
+  { name = "tests2", path = "../exercises/17_tests/tests2.rs" },
+  { name = "tests2_sol", path = "../solutions/17_tests/tests2.rs" },
+  { name = "tests3", path = "../exercises/17_tests/tests3.rs" },
+  { name = "tests3_sol", path = "../solutions/17_tests/tests3.rs" },
+  { name = "iterators1", path = "../exercises/18_iterators/iterators1.rs" },
+  { name = "iterators1_sol", path = "../solutions/18_iterators/iterators1.rs" },
+  { name = "iterators2", path = "../exercises/18_iterators/iterators2.rs" },
+  { name = "iterators2_sol", path = "../solutions/18_iterators/iterators2.rs" },
+  { name = "iterators3", path = "../exercises/18_iterators/iterators3.rs" },
+  { name = "iterators3_sol", path = "../solutions/18_iterators/iterators3.rs" },
+  { name = "iterators4", path = "../exercises/18_iterators/iterators4.rs" },
+  { name = "iterators4_sol", path = "../solutions/18_iterators/iterators4.rs" },
+  { name = "iterators5", path = "../exercises/18_iterators/iterators5.rs" },
+  { name = "iterators5_sol", path = "../solutions/18_iterators/iterators5.rs" },
+  { name = "box1", path = "../exercises/19_smart_pointers/box1.rs" },
+  { name = "box1_sol", path = "../solutions/19_smart_pointers/box1.rs" },
+  { name = "rc1", path = "../exercises/19_smart_pointers/rc1.rs" },
+  { name = "rc1_sol", path = "../solutions/19_smart_pointers/rc1.rs" },
+  { name = "arc1", path = "../exercises/19_smart_pointers/arc1.rs" },
+  { name = "arc1_sol", path = "../solutions/19_smart_pointers/arc1.rs" },
+  { name = "cow1", path = "../exercises/19_smart_pointers/cow1.rs" },
+  { name = "cow1_sol", path = "../solutions/19_smart_pointers/cow1.rs" },
+  { name = "threads1", path = "../exercises/20_threads/threads1.rs" },
+  { name = "threads1_sol", path = "../solutions/20_threads/threads1.rs" },
+  { name = "threads2", path = "../exercises/20_threads/threads2.rs" },
+  { name = "threads2_sol", path = "../solutions/20_threads/threads2.rs" },
+  { name = "threads3", path = "../exercises/20_threads/threads3.rs" },
+  { name = "threads3_sol", path = "../solutions/20_threads/threads3.rs" },
+  { name = "macros1", path = "../exercises/21_macros/macros1.rs" },
+  { name = "macros1_sol", path = "../solutions/21_macros/macros1.rs" },
+  { name = "macros2", path = "../exercises/21_macros/macros2.rs" },
+  { name = "macros2_sol", path = "../solutions/21_macros/macros2.rs" },
+  { name = "macros3", path = "../exercises/21_macros/macros3.rs" },
+  { name = "macros3_sol", path = "../solutions/21_macros/macros3.rs" },
+  { name = "macros4", path = "../exercises/21_macros/macros4.rs" },
+  { name = "macros4_sol", path = "../solutions/21_macros/macros4.rs" },
+  { name = "clippy1", path = "../exercises/22_clippy/clippy1.rs" },
+  { name = "clippy1_sol", path = "../solutions/22_clippy/clippy1.rs" },
+  { name = "clippy2", path = "../exercises/22_clippy/clippy2.rs" },
+  { name = "clippy2_sol", path = "../solutions/22_clippy/clippy2.rs" },
+  { name = "clippy3", path = "../exercises/22_clippy/clippy3.rs" },
+  { name = "clippy3_sol", path = "../solutions/22_clippy/clippy3.rs" },
+  { name = "using_as", path = "../exercises/23_conversions/using_as.rs" },
+  { name = "using_as_sol", path = "../solutions/23_conversions/using_as.rs" },
+  { name = "from_into", path = "../exercises/23_conversions/from_into.rs" },
+  { name = "from_into_sol", path = "../solutions/23_conversions/from_into.rs" },
+  { name = "from_str", path = "../exercises/23_conversions/from_str.rs" },
+  { name = "from_str_sol", path = "../solutions/23_conversions/from_str.rs" },
+  { name = "try_from_into", path = "../exercises/23_conversions/try_from_into.rs" },
+  { name = "try_from_into_sol", path = "../solutions/23_conversions/try_from_into.rs" },
+  { name = "as_ref_mut", path = "../exercises/23_conversions/as_ref_mut.rs" },
+  { name = "as_ref_mut_sol", path = "../solutions/23_conversions/as_ref_mut.rs" },
+]
+
+[package]
+name = "exercises"
+edition = "2024"
+# Don't publish the exercises on crates.io!
+publish = false
+
+[profile.release]
+panic = "abort"
+
+[profile.dev]
+panic = "abort"
+
+[lints.rust]
+# You shouldn't write unsafe code in Rustlings!
+unsafe_code = "forbid"
+# You don't need unstable features in Rustlings and shouldn't rely on them while learning Rust.
+unstable_features = "forbid"
+# Dead code warnings can't be avoided in some exercises and might distract while learning.
+dead_code = "allow"
+
+[lints.clippy]
+# You forgot a `todo!()`!
+todo = "forbid"
+# This can only happen by mistake in Rustlings.
+empty_loop = "forbid"
+# No infinite loops are needed in Rustlings.
+infinite_loop = "deny"
+# You shouldn't leak memory while still learning Rust!
+mem_forget = "deny"
+# Currently, there are no disallowed methods. This line avoids problems when developing Rustlings.
+disallowed_methods = "allow"
diff --git a/solutions/18_iterators/iterators3.rs b/solutions/18_iterators/iterators3.rs
index 11aa1ec8ce..eb8bfc7d15 100644
--- a/solutions/18_iterators/iterators3.rs
+++ b/solutions/18_iterators/iterators3.rs
@@ -24,19 +24,33 @@ fn divide(a: i64, b: i64) -> Result<i64, DivisionError> {
     Ok(a / b)
 }
 
-fn result_with_list() -> Result<Vec<i64>, DivisionError> {
+fn result_with_list(numbers: Vec<i64>, b: i64) -> Result<Vec<i64>, DivisionError> {
     //                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-    let numbers = [27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
+    let division_results = numbers.into_iter().map(|n| divide(n, b));
     // Collects to the expected return type. Returns the first error in the
     // division results (if one exists).
-    division_results.collect()
+    match division_results.find(|n| match n {
+        Ok(num) => return false,
+        Err(e) => return true,
+    }) {
+        Some(r) => return Err(r.unwrap_err()),
+        None => {
+            let ans: Vec<i64> = division_results
+                .map(|n| {
+                    return match n {
+                        Ok(num) => return num,
+                        Err(e) => return -1,
+                    };
+                })
+                .collect();
+            return Ok(ans);
+        }
+    }
 }
 
-fn list_of_results() -> Vec<Result<i64, DivisionError>> {
+fn list_of_results(numbers: Vec<i64>, b: i64) -> Vec<Result<i64, DivisionError>> {
     //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-    let numbers = [27, 297, 38502, 81];
-    let division_results = numbers.into_iter().map(|n| divide(n, 27));
+    let division_results = numbers.into_iter().map(|n| divide(n, b));
     // Collects to the expected return type.
     division_results.collect()
 }
@@ -76,11 +90,17 @@ mod tests {
 
     #[test]
     fn test_result_with_list() {
-        assert_eq!(result_with_list().unwrap(), [1, 11, 1426, 3]);
+        assert_eq!(
+            result_with_list(vec![27, 297, 38502, 81], 27).unwrap(),
+            [1, 11, 1426, 3]
+        );
     }
 
     #[test]
     fn test_list_of_results() {
-        assert_eq!(list_of_results(), [Ok(1), Ok(11), Ok(1426), Ok(3)]);
+        assert_eq!(
+            list_of_results(vec![27, 297, 38502, 81], 27),
+            [Ok(1), Ok(11), Ok(1426), Ok(3)]
+        );
     }
 }