diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..b94c7a5
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "reve-rs"
+version = "0.1.0"
diff --git a/src/lib.rs b/src/lib.rs
index b93cf3f..e19a164 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,14 +1,15 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
+pub fn reverse_string(input: &str) -> String {
+    input.chars().rev().collect()
 }
 
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
+        let result = reverse_string("aezakmi");
+        assert_eq!(result, "imkazea");
     }
 }