feat: add initial implementation of Cargo.toml, Cargo.lock, and lib.rs with get_concatenation function

1929_concatenation_of_array/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "concatenation_of_array"
+version = "0.1.0"

1929_concatenation_of_array/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "concatenation_of_array"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

1929_concatenation_of_array/src/lib.rs

@@ -0,0 +1,7 @@
+pub struct Solution;
+
+impl Solution {
+    pub fn get_concatenation(nums: Vec<i32>) -> Vec<i32> {
+        vec![nums.clone(), nums].concat()
+    }
+}