| Write cpp code to Create a file decryption utility with key validation using N/A. accepts encrypted file path and decryption key; validates path and key; decrypts file content; returns decrypted data. Structure the project as: src/, utils/file_decryptor.cpp, validators/path_validator.cpp. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |