# Simple Substitution Cipher

## Description
A simple substitution cipher replaces each letter in the plaintext with another letter from the alphabet, based on a predetermined key.

## How to Build
1. Navigate to the `build` directory.
2. Run `make` to compile the project.

## How to Run
1. After building, you will find an executable named `substitution_cipher` in the `build` directory.
2. Run it using `./substitution_cipher`.

## How to Clean
- Run `make clean` in the `build` directory to remove all compiled files.