#!/usr/bin/env python3

from pathlib import Path

def main():
    with (Path(__file__).parent / "file").open('rb') as file:
        content = file.read()

    JFIF_MAGIC_BYTES = b"\xFF\xD8"
    new_content = JFIF_MAGIC_BYTES + content[2:]

    with (Path(__file__).parent / "file.jpg").open('wb') as file:
        file.write(new_content)

if __name__ == '__main__':
    main()