Cache Request Execution Results

# Introduction

In this project, you will learn how to implement a caching library that supports expiration time based on the `singleflight` package in Go. This caching library can be used in distributed systems to cache the execution results of requests, improving the performance of your application.

## 👀 Preview

$ /usr/local/go/bin/go test --race
PASS
ok      cacheflight     1.263s

## 🎯 Tasks

In this project, you will learn:

- How to initialize a Go module and install the required packages
- How to implement the caching library using the `singleflight` package
- How to test the caching library to ensure it works as expected

## 🏆 Achievements

After completing this project, you will be able to:

- Understand the basic concepts of caching and the `singleflight` package in Go
- Implement a caching library that supports expiration time
- Integrate the caching library into your distributed system to improve the performance of your application