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38 lines
697 B
38 lines
697 B
4 years ago
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## doubtful
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### Instructions
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Write a function called `doubtful` that adds to every string passed to it a question mark (?)
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You have to fix the code to make it compile an for that you can only modify the code where is indicated
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### Expected
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```rust
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pub fn doubtful(s: &mut String) {
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}
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```
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### Usage
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Here is a program to test your function
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```rust
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fn main() {
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let mut s = String::from("Hello");
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println!("Before changing the string: {}", s);
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doubtful(&mut s);
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println!("After changing the string: {}", s);
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}
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```
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And its output
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```console
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student@ubuntu:~/[[ROOT]]/test$ cargo run
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Before changing the string: Hello
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After changing the string: Hello?
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student@ubuntu:~/[[ROOT]]/test$
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```
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