🛰️ Mars Rover

🚀 Features

• 🔧 Gradle wrapper included
• 🧹 Ktlint & Detekt code quality checks
• 🧪 Unit testing with JUnit
• 📊 Code coverage via JaCoCo
• 🤖 CI/CD with GitHub Actions
• ☁️ Codecov integration
• ☁️ DeepSource integration

🧰 Setup

# Clone and enter project
git clone https://github.com/appsoluut/dojo-mars-rover
cd Rover

# Build and test
./gradlew build test

# Run Detekt and Ktlint checks
./gradlew detekt ktlintCheck

Problem

NASA is landing a robotic rover on a rectangular plateau on Mars.
This plateau must be explored systematically so that the rover’s on-board cameras can survey the terrain and send images back to Earth.

A rover’s position is represented by:

• Two integers (X, Y) indicating its coordinates, and
• A letter indicating its current heading:
  • N (North)
  • E (East)
  • S (South)
  • W (West)

The plateau is divided into a grid, and the rover moves across it based on simple navigation commands.

For example, a position of 0 0 N means the rover is at the bottom-left corner, facing North.

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Instructions

NASA can send the following commands to the rover:

• L ➔ Turn 90 degrees left without moving from the current spot.
• R ➔ Turn 90 degrees right without moving from the current spot.
• M ➔ Move forward one grid point in the direction it is facing.

Important:
Moving North from (x, y) goes to (x, y+1).
Moving East from (x, y) goes to (x+1, y), and so on.

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Input

The input consists of:

1. First parameter: The rover’s starting position: two integers and a letter (e.g., 1 2 N).

2. Second parameter: A string of movement instructions (e.g., LMLMLMLMM).

The rover processes all instructions in sequence.

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Output

After executing all the commands, the rover reports its final coordinates and heading.

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Example

Starting Position	Instructions	Expected Output
1 2 N		1 2 N
1 2 N	L	1 2 W
1 2 W	L	1 2 S
1 2 S	L	1 2 E
1 2 E	L	1 2 N
1 2 N	R	1 2 E
1 2 E	R	1 2 S
1 2 S	R	1 2 W
1 2 W	R	1 2 N
1 2 N	M	1 3 N
1 2 E	M	2 2 E
1 2 S	M	1 1 S
1 2 W	M	0 2 W
1 2 N	LMLMLMLMM	1 3 N
3 3 E	MMRMMRMRRM	5 1 E

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🎯 Your Mission

You have been given a working but fragile codebase that controls a single rover.

Your goal:

• Refactor the code to make it clean, expressive, and easy to maintain.
• Prepare the code for future enhancements.
• Eliminate technical debt, improve readability, and structure it to allow easily adding new features later.

🧠 Hint:
Future missions may require handling multiple rovers at once.
Your design should naturally evolve toward making this possible.

✅ Do not change the existing behavior.
✅ All existing tests must continue to pass.

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🌟 Good luck, engineer of Mars!

Craft code that's ready for exploration... and evolution! 🚀