Add exercise reverse_string subject and test

rust/tests/reverse_string_test/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "reverse-string_test"
+version = "0.1.0"
+dependencies = [
+ "reverse_string",
+]
+
+[[package]]
+name = "reverse_string"
+version = "0.1.0"

rust/tests/reverse_string_test/Cargo.toml

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+[package]
+name = "reverse-string_test"
+version = "0.1.0"
+authors = ["MSilva95 <miguel-silva98@hotmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+reverse_string = { path = "../../../../rust-piscine-solutions/reverse_string"}

rust/tests/reverse_string_test/src/main.rs

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+// Write a function `rev_str` that takes a `&str` as a parameter, and returns a string with its words reversed.
+
+#[allow(dead_code)]
+fn main() {
+	println!("{}", rev_str("Hello, world!"));
+	println!("{}", rev_str("Hello, my name is Roman"));
+	println!("{}", rev_str("I have a nice car!"));
+	println!("{}", rev_str("How old are You"));
+	println!("{}", rev_str("ex: this is an example água"));
+}
+
+use reverse_string::rev_str;
+
+#[allow(dead_code)]
+fn test_reverse(input: &str, expected: &str) {
+	assert_eq!(&rev_str(input), expected);
+}
+
+#[test]
+// testing just one word
+fn test_simple_word() {
+	test_reverse("robot", "tobor");
+	test_reverse("Ramen", "nemaR");
+	test_reverse("I'm hungry!", "!yrgnuh m'I");
+	test_reverse("racecar", "racecar");
+	test_reverse("drawer", "reward");
+	test_reverse("子猫", "猫子");
+	test_reverse("", "");
+}
+
+#[test]
+// testing two or more words
+fn test_more_than_one() {
+	test_reverse("Hello, world!", "!dlrow ,olleH");
+	test_reverse("Hello, my name is Roman", "namoR si eman ym ,olleH");
+	test_reverse("I have a nice car!", "!rac ecin a evah I");
+	test_reverse("How old are You", "uoY era dlo woH");
+	test_reverse("ex: this is an example água", "augá elpmaxe na si siht :xe");
+}

subjects/reverse_string/README.md

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+## reverse_string
+
+### Instructions
+
+Write a function `rev_str` that takes a `&str` as a parameter, and returns a string with its words reversed.
+
+### Expected Functions
+
+```rust
+pub fn rev_str(input: &str) -> String {
+}
+```
+
+### Usage
+
+```rust
+use reverse_string::rev_str;
+
+fn main() {
+	println!("{}", rev_str("Hello, world!"));
+	println!("{}", rev_str("Hello, my name is Roman"));
+	println!("{}", rev_str("I have a nice car!"));
+	println!("{}", rev_str("How old are You"));
+	println!("{}", rev_str("ex: this is an example água"));
+}
+```
+
+And it's output:
+
+```console
+!dlrow ,olleH
+namoR si eman ym ,olleH
+!rac ecin a evah I
+uoY era dlo woH
+augá elpmaxe na si siht :xe
+```