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Hen00af/README.md

๐Ÿ‘‹ Hey, I'm Hen00af (Seiya Hattori)

I'm a passionate low-level & backend developer currently diving deep into system programming at 42Tokyo.
From building my own shell (yes, like bash) to experimenting with Git internals and Linux tools, I love making complex things simple and fast.


๐Ÿ›  Skills & Tools

C C++ Bash Python Docker Ruby on Rails pandas Matplotlib Go TypeScript CSS3 HTML5 JavaScript

  • ๐Ÿ”ง C / System Programming (fork, malloc, signals, execve, etc.)
  • ๐Ÿง Linux Tools (gdb, valgrind, make)
  • โš™๏ธ DevOps (CI/CD, Makefiles, Git workflow)
  • ๐Ÿงฑ Web Development (Ruby on Rails, TypeScript, Docker)
  • ๐Ÿ“Š Data Science Tools (pandas, Matplotlib)

If you would like to learn more about my school, 42,

click โžก 42 Curriculum


๐Ÿš€ Notable Projects

  • Minishell โ€“ Recreated a simplified bash shell in C with pipe, redirect, and built-in command support with 2 members
  • AI shiritori - Shiritori Game with Gemini API in Ruby on rails with 5 members.
  • Cub3D - 3D graphic game in C, like Doom, with ray-casting and DDA-Algo.

โŒ› WakaTime Coding Stats

Code Time

Lines of code

๐Ÿฑ My GitHub Data

๐Ÿ“ฆ 115.1 kB Used in GitHub's Storage

๐Ÿ† 518 Contributions in the Year 2025

๐Ÿšซ Not Opted to Hire

๐Ÿ“œ 29 Public Repositories

๐Ÿ”‘ 20 Private Repositories

I'm an Early ๐Ÿค

๐ŸŒž Morning                819 commits         โ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   11.98 % 
๐ŸŒ† Daytime                2869 commits        โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   41.97 % 
๐ŸŒƒ Evening                2795 commits        โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   40.89 % 
๐ŸŒ™ Night                  353 commits         โ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   05.16 % 

๐Ÿ“Š This Week I Spent My Time On

๐Ÿ•‘๏ธŽ Time Zone: Asia/Tokyo

๐Ÿ’ฌ Programming Languages: 
C++                      5 hrs 20 mins       โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   44.48 % 
Python                   4 hrs 47 mins       โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   39.87 % 
C                        1 hr 8 mins         โ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   09.49 % 
Makefile                 28 mins             โ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   03.99 % 
Markdown                 7 mins              โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   01.02 % 

๐Ÿ”ฅ Editors: 
VS Code                  12 hrs 1 min        โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆ   100.00 % 

๐Ÿ’ป Operating System: 
Linux                    10 hrs 7 mins       โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘   84.20 % 
WSL                      1 hr 54 mins        โ–ˆโ–ˆโ–ˆโ–ˆโ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘โ–‘   15.80 % 

Timeline

Lines of Code chart

Last Updated on 27/09/2025 18:47:44 UTC


๐Ÿ“Š GitHub Stats


๐Ÿ“ซ Get in Touch

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