Create a method that checks if a product SKU exists in inventory and has sufficient stock.

Examples:

Input: Map<String, Integer> inventory = new Map<String, Integer>{'SKU001' => 5, 'SKU002' => 0, 'SKU003' => 12}; checkInventory(inventory, 'SKU001'); Output: true Explanation: SKU001 exists in inventory and has 5 items in stock Input: Map<String, Integer> inventory = new Map<String, Integer>{'SKU001' => 5, 'SKU002' => 0, 'SKU003' => 12}; checkInventory(inventory, 'SKU002'); Output: false Explanation: SKU002 exists but has 0 items in stock Input: Map<String, Integer> inventory = new Map<String, Integer>{'SKU001' => 5, 'SKU002' => 0, 'SKU003' => 12}; checkInventory(inventory, 'SKU004'); Output: false Explanation: SKU004 doesn't exist in inventory
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