How to pass the Gzip Compression test?

gzip is a file format and a software application used for file compression and decompression. The program was created by Jean-loup Gailly and Mark Adler as a free software replacement for the compress program used in early Unix systems, and intended for use by GNU (from where the "g" of gzip is derived). Version 0.1 was first publicly released on 31 October 1992, and version 1.0 followed in February 1993.
Although its file format also allows for multiple such streams to be concatenated (gzipped files are simply decompressed concatenated as if they were originally one file),[5] gzip is normally used to compress just single files.[6] Compressed archives are typically created by assembling collections of files into a single tar archive (also called tarball),[7] and then compressing that archive with gzip. The final compressed file usually has the extension .tar.gz or .tgz.

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