Caesar Cipher Challenge

Welcome to the Caesar Cipher Challenge! In this mission, your robot's navigation system has been encrypted. You need to decode the commands to get the robot to the target. The target however has been hidden, so you can't see it yet.

Your Mission

Your goal is to write a function that decrypts a list of commands encrypted with a ROT13 cipher (a Caesar cipher with a shift of 13) and executes them. The robot must collect the gem to win.

How to win?

• Decrypt the provided list of commands using ROT13.
• Execute the decrypted commands to navigate the robot to the gem.
• PICKUP the gem.

Instructions

1. Analyze the Encrypted Commands: You are given an array of strings like "SBEJNEQ", "YRSG", etc.
2. Implement ROT13: Create a function that shifts each letter in a string by 13 positions in the alphabet.
   • A becomes N, B becomes O, ..., N becomes A.
   • The cipher wraps around: Z is followed by A.
3. Translate and Execute: Loop through the encrypted commands, translate them, and pass the result to await robot.executePath(translatedCommands).
4. Pickup: After executing the commands, collect the gem with await robot.pickup().

Example

• "SBEJNEQ" -> "FORWARD"
• "YRSG" -> "LEFT"
• "EVTUG" -> "RIGHT"

Hints

What is ROT13?

ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. Because the basic Latin alphabet has 26 letters, applying ROT13 twice restores the original text.

Character Codes

You can use ASCII character codes to help with the shift.

• String.fromCharCode(code) creates a character from a code.
• 'A'.charCodeAt(0) gives you the code for 'A' (65).

The Modulo Operator (%)

The modulo operator is very useful for wrapping around the alphabet. index = (index + 13) % 26

Suggested Implementation

const ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

function translate(command: string) {
    // Your implementation here
}