feat: implement LogEntry model and pass unit tests

src/main/java/com/github/ignorant05/log_processing_system/LogEntry.java

@@ -0,0 +1,32 @@
+package com.github.ignorant05.log_processing_system;
+
+import java.time.Instant;
+import java.util.UUID;
+
+public class LogEntry {
+    private String id;
+    private String level;
+    private String message;
+    private String timestamp;
+
+    public LogEntry(String level, String message) {
+        this.id = UUID.randomUUID().toString();
+        this.level = level;
+        this.message = message;
+        this.timestamp = Instant.now().toString();
+    }
+
+    // Getters
+    public String getId() { return id; }
+    public String getLevel() { return level; }
+    public String getMessage() { return message; }
+    public String getTimestamp() { return timestamp; }
+
+    // Serialization for the task
+    public String toJson() {
+        return String.format(
+                "{\"id\":\"%s\", \"level\":\"%s\", \"message\":\"%s\", \"timestamp\":\"%s\"}",
+                id, level, message, timestamp
+        );
+    }
+}

src/test/java/com/github/ignorant05/log_processing_system/LogEntryTest.java

@@ -0,0 +1,21 @@
+package com.github.ignorant05.log_processing_system;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class LogEntryTest {
+
+    @Test
+    void testLogEntryCreation() {
+        LogEntry log = new LogEntry("INFO", "Test log message");
+        assertNotNull(log.getId());
+        assertEquals("INFO", log.getLevel());
+    }
+
+    @Test
+    void testJsonFormat() {
+        LogEntry log = new LogEntry("DEBUG", "JSON check");
+        String json = log.toJson();
+        assertTrue(json.contains("\"level\":\"DEBUG\""));
+    }
+}