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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