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## to_url
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### Instructions
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Define a **function** called `to_url` that takes a string and substitutes every white-space with '%20'.
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### Expected Function
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```rust
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pub fn to_url(s: &str) -> 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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use to_url::*;
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fn main() {
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let s = "Hello, world!";
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println!("{} to be use as an url is {}", s, to_url(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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Hello, world! to be use as an url is Hello,%20world!
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student@ubuntu:~/[[ROOT]]/test$
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```
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