# Alphametics

Write a function to solve alphametics puzzles.

[Alphametics](https://en.wikipedia.org/wiki/Alphametics) is a puzzle where
letters in words are replaced with numbers.

For example `SEND + MORE = MONEY`:

```text
  S E N D
  M O R E +
-----------
M O N E Y
```

Replacing these with valid numbers gives:

```text
  9 5 6 7
  1 0 8 5 +
-----------
1 0 6 5 2
```

This is correct because every letter is replaced by a different number and the
words, translated into numbers, then make a valid sum.

Each letter must represent a different digit, and the leading digit of
a multi-digit number must not be zero.

Write a function to solve alphametics puzzles.

## Rust Installation

Refer to the [exercism help page][help-page] for Rust installation and learning
resources.

## Writing the Code

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 wich 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 all tests without editing the tests source file, use:

```bash
$ cargo test -- --ignored
```

To run a specific test, for example `some_test`, you can use:

```bash
$ cargo test some_test
```

If the specfic test is ignored use:

```bash
$ cargo test some_test -- --ignored
```

To learn more about Rust tests refer to the [online test documentation][rust-tests]

Make sure to read the [Modules](https://doc.rust-lang.org/book/second-edition/ch07-00-modules.html) chapter if you
haven't already, it will help you with organizing your files.

## Feedback, Issues, Pull Requests

The [exercism/rust](https://github.com/exercism/rust) repository on GitHub is the home for all of the Rust exercises. If you have feedback about an exercise, or want to help implement new exercises, head over there and create an issue. Members of the rust track team are happy to help!

If you want to know more about Exercism, take a look at the [contribution guide](https://github.com/exercism/docs/blob/master/contributing-to-language-tracks/README.md).

[help-page]: http://exercism.io/languages/rust
[modules]: https://doc.rust-lang.org/book/second-edition/ch07-00-modules.html
[cargo]: https://doc.rust-lang.org/book/second-edition/ch14-00-more-about-cargo.html
[rust-tests]: https://doc.rust-lang.org/book/second-edition/ch11-02-running-tests.html

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.