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docs(rust piscine): Add invert_sentence optional exercise subject (#2221)
* docs(rust piscine): Add invert_sentence optional exercise subject * docs(rust piscine): Update invert_sentence subject * docs(rust piscine): fix typo in invert_sentence exercise
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## invert_sentence
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### Instructions
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Write a function called `invert_sentence` that takes a string as input and returns the words in the string in reverse order.
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In other words, the function should take a sentence as input and return a new sentence with the words reversed.
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### Expected Function
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```rust
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pub fn invert_sentence(string: &str) -> String {
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// Your code goes here
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}
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```
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### Usage
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Here is a possible runner to test your function :
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```rust
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use invert_sentence::invert_sentence;
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fn main() {
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println!("{}", invert_sentence("Rust is Awesome"));
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println!("{}", invert_sentence(" word1 word2 "));
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println!("{}", invert_sentence("Hello, World!"));
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}
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```
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And its output:
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```console
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$ cargo run | cat -e
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Awesome is Rust$
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word2 word1 $
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World! Hello,$
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$
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```
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