Description

In the last stage, implement the checkout command. It allows a user to switch between commits and restore the contents of the files according to the current commit.

Get the files you need from the commit directory by the commit id and rewrite the current files.

.
├── vcs
│   ├── commits
│   │   ├── 2853da19f31cfc086cd5c40915253cb28d5eb01c
│   │   │   ├── file1.txt
│   │   │   └── file2.txt
│   │   └── 0b4f05fcd3e1dcc47f58fed4bb189196f99da89a
│   │       ├── file1.txt
│   │       └── file2.txt
│   ├── config.txt
│   ├── index.txt
│   └── log.txt
├── file1.txt
├── file2.txt
└── untracked_file.txt

Objectives

The checkout command must be passed to the program together with the commit ID to indicate which commit should be used. If a commit with the given ID exists, the contents of the tracked file should be restored in accordance with this commit.

Examples

The greater-than symbol followed by a space (> ) represents the user input. Note that it's not part of the input.

Example 1: the log argument

commit 2853da19f31cfc086cd5c40915253cb28d5eb01c
Author: John
Changed several lines of code

commit 0b4f05fcd3e1dcc47f58fed4bb189196f99da89a
Author: John
Added several lines of code

Example 2: the checkout 0b4f05fcd3e1dcc47f58fed4bb189196f99da89a argument

Switched to commit 0b4f05fcd3e1dcc47f58fed4bb189196f99da89a.

Example 3: the checkout fb92cc1be7f60c8d9acf74cbd4a67841d8d2e844 argument

Commit does not exist.

Example 4: the checkout argument

Commit id was not passed.