easiest

rust/raindrops/.exercism/config.json

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+{
+  "authors": [
+    "EduardoBautista"
+  ],
+  "contributors": [
+    "ashleygwilliams",
+    "ClashTheBunny",
+    "coriolinus",
+    "cwhakes",
+    "eddyp",
+    "EduardoBautista",
+    "efx",
+    "ErikSchierboom",
+    "IanWhitney",
+    "kytrinyx",
+    "leoyvens",
+    "lutostag",
+    "mkantor",
+    "nfiles",
+    "petertseng",
+    "rofrol",
+    "stevejb71",
+    "stringparser",
+    "xakon",
+    "ZapAnton"
+  ],
+  "files": {
+    "solution": [
+      "src/lib.rs",
+      "Cargo.toml"
+    ],
+    "test": [
+      "tests/raindrops.rs"
+    ],
+    "example": [
+      ".meta/example.rs"
+    ]
+  },
+  "blurb": "Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.",
+  "source": "A variation on FizzBuzz, a famous technical interview question that is intended to weed out potential candidates. That question is itself derived from Fizz Buzz, a popular children's game for teaching division.",
+  "source_url": "https://en.wikipedia.org/wiki/Fizz_buzz"
+}

rust/raindrops/.gitignore

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+/target
+Cargo.lock

rust/raindrops/Cargo.toml

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+[package]
+name = "raindrops"
+version = "0.1.0"
+edition = "2024"
+
+# Not all libraries from crates.io are available in Exercism's test runner.
+# The full list of available libraries is here:
+# https://github.com/exercism/rust-test-runner/blob/main/local-registry/Cargo.toml
+[dependencies]

rust/raindrops/HELP.md

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+# Help
+
+## Running the tests
+
+Execute the tests with:
+
+```bash
+$ cargo test
+```
+
+All but the first test have been ignored. After you get the first test to
+pass, open the tests source file which is located in the `tests` directory
+and remove the `#[ignore]` flag from the next test and get the tests to pass
+again. Each separate test is a function with `#[test]` flag above it.
+Continue, until you pass every test.
+
+If you wish to run _only ignored_ tests without editing the tests source file, use:
+
+```bash
+$ cargo test -- --ignored
+```
+
+If you are using Rust 1.51 or later, you can run _all_ tests with
+
+```bash
+$ cargo test -- --include-ignored
+```
+
+To run a specific test, for example `some_test`, you can use:
+
+```bash
+$ cargo test some_test
+```
+
+If the specific test is ignored, use:
+
+```bash
+$ cargo test some_test -- --ignored
+```
+
+To learn more about Rust tests refer to the online [test documentation][rust-tests].
+
+[rust-tests]: https://doc.rust-lang.org/book/ch11-02-running-tests.html
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/lib.rs Cargo.toml` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Rust track's documentation](https://exercism.org/docs/tracks/rust)
+- The [Rust track's programming category on the forum](https://forum.exercism.org/c/programming/rust)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+## Rust Installation
+
+Refer to the [exercism help page][help-page] for Rust installation and learning
+resources.
+
+## Submitting the solution
+
+Generally you should submit all files in which you implemented your solution (`src/lib.rs` in most cases). If you are using any external crates, please consider submitting the `Cargo.toml` file. This will make the review process faster and clearer.
+
+## Feedback, Issues, Pull Requests
+
+Head to [the forum](https://forum.exercism.org/c/programming/rust/) and create a post to provide feedback about an exercise or if you want to help implement new exercises.
+Members of the rust track team are happy to help!
+
+The GitHub [track repository][github] is the home for all of the Rust exercises.
+
+If you want to know more about Exercism, take a look at the [contribution guide].
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+
+[help-page]: https://exercism.org/tracks/rust/learning
+[github]: https://github.com/exercism/rust
+[contribution guide]: https://exercism.org/docs/community/contributors

rust/raindrops/README.md

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+# Raindrops
+
+Welcome to Raindrops on Exercism's Rust Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+Raindrops is a slightly more complex version of the FizzBuzz challenge, a classic interview question.
+
+## Instructions
+
+Your task is to convert a number into its corresponding raindrop sounds.
+
+If a given number:
+
+- is divisible by 3, add "Pling" to the result.
+- is divisible by 5, add "Plang" to the result.
+- is divisible by 7, add "Plong" to the result.
+- **is not** divisible by 3, 5, or 7, the result should be the number as a string.
+
+## Examples
+
+- 28 is divisible by 7, but not 3 or 5, so the result would be `"Plong"`.
+- 30 is divisible by 3 and 5, but not 7, so the result would be `"PlingPlang"`.
+- 34 is not divisible by 3, 5, or 7, so the result would be `"34"`.
+
+~~~~exercism/note
+A common way to test if one number is evenly divisible by another is to compare the [remainder][remainder] or [modulus][modulo] to zero.
+Most languages provide operators or functions for one (or both) of these.
+
+[remainder]: https://exercism.org/docs/programming/operators/remainder
+[modulo]: https://en.wikipedia.org/wiki/Modulo_operation
+~~~~
+
+## Source
+
+### Created by
+
+- @EduardoBautista
+
+### Contributed to by
+
+- @ashleygwilliams
+- @ClashTheBunny
+- @coriolinus
+- @cwhakes
+- @eddyp
+- @EduardoBautista
+- @efx
+- @ErikSchierboom
+- @IanWhitney
+- @kytrinyx
+- @leoyvens
+- @lutostag
+- @mkantor
+- @nfiles
+- @petertseng
+- @rofrol
+- @stevejb71
+- @stringparser
+- @xakon
+- @ZapAnton
+
+### Based on
+
+A variation on FizzBuzz, a famous technical interview question that is intended to weed out potential candidates. That question is itself derived from Fizz Buzz, a popular children's game for teaching division. - https://en.wikipedia.org/wiki/Fizz_buzz

rust/raindrops/src/lib.rs

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+pub fn raindrops(n: u32) -> String {
+    let mut res = String::new();
+    if 0 == n % 3 {
+        res.push_str("Pling");
+    }
+    if 0 == n % 5 {
+        res.push_str("Plang");
+    }
+    if 0 == n % 7 {
+        res.push_str("Plong");
+    }
+
+    if res.is_empty() { n.to_string() } else { res }
+}

rust/raindrops/tests/raindrops.rs

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+use raindrops::*;
+
+#[test]
+fn the_sound_for_1_is_1() {
+    let input = 1;
+    let output = raindrops(input);
+    let expected = "1";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_3_is_pling() {
+    let input = 3;
+    let output = raindrops(input);
+    let expected = "Pling";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_5_is_plang() {
+    let input = 5;
+    let output = raindrops(input);
+    let expected = "Plang";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_7_is_plong() {
+    let input = 7;
+    let output = raindrops(input);
+    let expected = "Plong";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_6_is_pling_as_it_has_a_factor_3() {
+    let input = 6;
+    let output = raindrops(input);
+    let expected = "Pling";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn test_2_to_the_power_3_does_not_make_a_raindrop_sound_as_3_is_the_exponent_not_the_base() {
+    let input = 8;
+    let output = raindrops(input);
+    let expected = "8";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_9_is_pling_as_it_has_a_factor_3() {
+    let input = 9;
+    let output = raindrops(input);
+    let expected = "Pling";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_10_is_plang_as_it_has_a_factor_5() {
+    let input = 10;
+    let output = raindrops(input);
+    let expected = "Plang";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_14_is_plong_as_it_has_a_factor_of_7() {
+    let input = 14;
+    let output = raindrops(input);
+    let expected = "Plong";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_15_is_plingplang_as_it_has_factors_3_and_5() {
+    let input = 15;
+    let output = raindrops(input);
+    let expected = "PlingPlang";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_21_is_plingplong_as_it_has_factors_3_and_7() {
+    let input = 21;
+    let output = raindrops(input);
+    let expected = "PlingPlong";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_25_is_plang_as_it_has_a_factor_5() {
+    let input = 25;
+    let output = raindrops(input);
+    let expected = "Plang";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_27_is_pling_as_it_has_a_factor_3() {
+    let input = 27;
+    let output = raindrops(input);
+    let expected = "Pling";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_35_is_plangplong_as_it_has_factors_5_and_7() {
+    let input = 35;
+    let output = raindrops(input);
+    let expected = "PlangPlong";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_49_is_plong_as_it_has_a_factor_7() {
+    let input = 49;
+    let output = raindrops(input);
+    let expected = "Plong";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_52_is_52() {
+    let input = 52;
+    let output = raindrops(input);
+    let expected = "52";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_105_is_plingplangplong_as_it_has_factors_3_5_and_7() {
+    let input = 105;
+    let output = raindrops(input);
+    let expected = "PlingPlangPlong";
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_sound_for_3125_is_plang_as_it_has_a_factor_5() {
+    let input = 3125;
+    let output = raindrops(input);
+    let expected = "Plang";
+    assert_eq!(output, expected);
+}