Create a simple utility class that stores and retrieves values using a Map. This question introduces the basic concept of key-value storage in Apex.

Examples:

Input: storeValue('name', 'John') getValue('name') Output: 'John' Explanation: The value 'John' was stored with key 'name' and then retrieved Input: storeValue('age', '25') getValue('age') Output: '25' Explanation: The value '25' was stored with key 'age' and then retrieved Input: getValue('address') Output: '' Explanation: No value exists for key 'address', so an empty string is returned
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