create EncryptionConsumer class

src/main/java/consumer/EncryptionConsumer.java

 package consumer;
 
-public class EncryptionConsumer {
-}
+import model.SequencedLine;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class EncryptionConsumer implements Runnable {
+    private final int consumerId;
+    private final BlockingQueue<SequencedLine> inputQueue;
+    private final BlockingQueue<SequencedLine> outputQueue;
+    private final AtomicBoolean productionFinished;
+    private final AtomicInteger activeConsumers;
+    private final EncryptionProcessor processor;
+
+    public EncryptionConsumer(int consumerId,
+                              BlockingQueue<SequencedLine> inputQueue,
+                              BlockingQueue<SequencedLine> outputQueue,
+                              AtomicBoolean productionFinished,
+                              AtomicInteger activeConsumers,
+                              EncryptionProcessor processor) {
+        this.consumerId = consumerId;
+        this.inputQueue = inputQueue;
+        this.outputQueue = outputQueue;
+        this.productionFinished = productionFinished;
+        this.activeConsumers = activeConsumers;
+        this.processor = processor;
+
+        // Increment active consumers counter
+        this.activeConsumers.incrementAndGet();
+    }
+
+    @Override
+    public void run() {
+        System.out.println("Consumer " + consumerId + " started work");
+        int processedCount = 0;
+
+        try {
+            // Continue processing until no more work
+            while (shouldContinueWorking()) {
+                // Get SequencedLine from input queue
+                SequencedLine inputLine = inputQueue.poll(1, java.util.concurrent.TimeUnit.SECONDS);
+
+                if (inputLine != null) {
+                    // Process the line
+                    String encryptedContent = processor.processLine(inputLine.getLine());
+
+                    // Create new SequencedLine with SAME sequence number
+                    SequencedLine outputLine = new SequencedLine(
+                            inputLine.getSequenceNumber(),
+                            encryptedContent
+                    );
+
+                    // Put result in output queue (may wait if queue is full)
+                    outputQueue.put(outputLine);
+                    processedCount++;
+
+                    // Log progress occasionally
+                    if (processedCount % 25 == 0) {
+                        System.out.println("Consumer " + consumerId + " processed " + processedCount + " lines");
+                    }
+                }
+            }
+
+        } catch (InterruptedException e) {
+            System.err.println("Consumer " + consumerId + " was interrupted");
+            Thread.currentThread().interrupt();
+        } finally {
+            // Decrement active consumers counter
+            int remainingConsumers = activeConsumers.decrementAndGet();
+            System.out.println("Consumer " + consumerId + " finished - processed " +
+                    processedCount + " lines, " + remainingConsumers + " consumers remaining");
+        }
+    }
+
+    private boolean shouldContinueWorking() {
+        // Continue if:
+        // 1. We haven't been interrupted, AND
+        // 2. Either: production isn't finished, OR input queue isn't empty
+        return !Thread.currentThread().isInterrupted() &&
+                (!productionFinished.get() || !inputQueue.isEmpty());
+    }
+
+    public int getConsumerId() {
+        return consumerId;
+    }
+}
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