Resolve merge conflicts and fix Maven build configuration

[Copilot]

Overview

This PR resolves merge conflicts in the insurance problems implementation and fixes the Maven project configuration to ensure a clean build with Java 11.

Issues Fixed

The repository had merge conflicts that resulted in duplicate code blocks appearing at the top of key source files, causing compilation failures:

• InsuranceProblems.java: Had ~80 lines of duplicate method definitions (problems #13, #17, #19, #21) appearing before the package declaration
• InsuranceProblemsTest.java: Had ~75 lines of duplicate test stubs (problems #14, #16, #18, #20, #22) appearing before the package declaration
• Diver.java: Had incorrect package declaration (package src.main.java.teamred; instead of package teamred;)

These conflicts prevented the project from compiling:

[ERROR] /home/runner/.../InsuranceProblems.java:[1,5] class, interface, or enum expected

Changes Made

1. Resolved Merge Conflicts

• Removed duplicate method implementations from the beginning of InsuranceProblems.java
• Removed duplicate test stubs from the beginning of InsuranceProblemsTest.java
• Fixed package declaration in Diver.java to match Maven project structure

2. Project Configuration

• Added .gitignore file to exclude Maven build artifacts (target/), IDE files, and OS-specific files
• Removed previously committed target/ directory from version control (build artifacts should not be committed)

Verification

After these changes:

• ✅ Maven build compiles successfully with Java 11
• ✅ All 6 tests pass without errors
• ✅ No compilation warnings or errors
• ✅ Project follows proper Maven directory structure

Implementation Summary

The PR maintains all the intended functionality:

• 8 problem solutions implemented (odd-numbered problems 1, 3, 5, 7, 9, 11, 13, 15)
• 3 bonus problems implemented (17, 19, 21)
• 6 AAA-style test stubs for even-numbered problems (2, 4, 6, 8, 10, 12)
• Maven configured with JUnit 5.10.2 for testing
• InsuranceRecord class with all required fields

Build output:

[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0
[INFO] BUILD SUCCESS

The project is now ready for review and merge.

Original prompt

Implement insurance problems solutions and tests (up to #15), resolve merge conflicts, and set up Maven
This pull request includes:

• Solutions for odd-numbered insurance problems up to #15
• AAA-style test stubs for even-numbered problems up to #12
• Maven project setup with JUnit 5
• Resolved merge conflicts in pom.xml and InsuranceRecord.java
• Project structure fixes for Maven compatibility

All tests pass and the project builds successfully with Java 11.

Please review and merge.

Created from VS Code via the [GitHub Pull Request](https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github) extension.

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