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adding one

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.17;
+
+/**
+ * @title GarageManager
+ * @dev Contract to manage a garage of cars for each user
+ */
+contract GarageManager {
+    mapping(address => Car[]) private garages;
+
+    struct Car {
+        string make;
+        string model;
+        string color;
+        uint numberOfDoors;
+    }
+
+    error BadCarIndex(uint256 index);
+
+    /**
+     * @dev Adds a new car to the caller's garage
+     * @param _make The make of the car
+     * @param _model The model of the car
+     * @param _color The color of the car
+     * @param _numberOfDoors The number of doors of the car
+     */
+    function addCar(string memory _make, string memory _model, string memory _color, uint _numberOfDoors) external {
+        garages[msg.sender].push(Car(_make, _model, _color, _numberOfDoors));
+    }
+
+    /**
+     * @dev Retrieves the caller's array of cars
+     * @return An array of `Car` structs
+     */
+    function getMyCars() external view returns (Car[] memory) {
+        return garages[msg.sender];
+    }
+
+    /**
+     * @dev Retrieves a specific user's array of cars
+     * @param _user The address of the user
+     * @return An array of `Car` structs
+     */
+    function getUserCars(address _user) external view returns (Car[] memory) {
+        return garages[_user];
+    }
+
+    /**
+     * @dev Updates a specific car in the caller's garage
+     * @param _index The index of the car in the garage array
+     * @param _make The new make of the car
+     * @param _model The new model of the car
+     * @param _color The new color of the car
+     * @param _numberOfDoors The new number of doors of the car
+     */
+    function updateCar(uint256 _index, string memory _make, string memory _model, string memory _color, uint _numberOfDoors) external {
+        if (_index >= garages[msg.sender].length) {
+            revert BadCarIndex({index: _index});
+        }
+        garages[msg.sender][_index] = Car(_make, _model, _color, _numberOfDoors);
+    }
+
+    /**
+     * @dev Deletes all cars in the caller's garage
+     */
+    function resetMyGarage() external {
+        delete garages[msg.sender];
+    }
+}