Add subject and test for the exercise `to_url`

rust/tests/to_url_test/Cargo.lock

@@ -0,0 +1,12 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "to_url"
+version = "0.1.0"
+
+[[package]]
+name = "to_url_test"
+version = "0.1.0"
+dependencies = [
+ "to_url",
+]

rust/tests/to_url_test/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "to_url_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+to_url = { path = "../../../../rust-piscine-solutions/to_url"}

rust/tests/to_url_test/src/main.rs

@@ -0,0 +1,19 @@
+// Define a function called `to_url` that takes a string and
+// substitutes every white-space with '%20'
+
+use to_url::*;
+
+fn main() {
+	let s = "Hello, world!";
+	println!("{} to be use as an url is {}", s, to_url(s));
+}
+
+#[cfg(test)]
+mod test {
+	use super::*;
+
+	#[test]
+	fn test_url() {
+		assert_eq!(to_url("this is my search"), "this%20is%20my%20search");
+	}
+}

subjects/to_url/README.md

@@ -0,0 +1,31 @@
+## to_url
+
+### Instructions
+
+Define a function called `to_url` that takes a string and substitutes every white-space with '%20'
+
+### Expected Function
+
+```rust
+pub fn to_url(s: &str) -> String {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	let s = "Hello, world!";
+	println!("{} to be use as an url is {}", s, to_url(s));
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Hello, world! to be use as an url is Hello,%20world!
+student@ubuntu:~/[[ROOT]]/test$
+```