Add reverse and its test

.gitignore

@@ -11,3 +11,8 @@ Cargo.lock
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
+
+
+#Added by cargo
+
+/target

Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "ci-test"
+version = "0.1.0"
+authors = ["KAAAsS <admin@kaaass.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/lib.rs

@@ -0,0 +1,18 @@
+pub fn reverse(s : &str) -> String {
+    s.chars().rev().collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_reverse() {
+        let query = "hello";
+
+        assert_eq!(
+            "olleh",
+            reverse(query)
+        );
+    }
+}

src/main.rs

@@ -0,0 +1,11 @@
+use std::env;
+use ci_test::reverse;
+
+fn main() {
+    // Read from argument
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 2 {
+        panic!("argument invalid");
+    }
+    println!("{}", reverse(&args[1]));
+}