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2025 July. The s21_string+ project is a custom implementation of C's standard string.h library, adding core functions like sprintf and sscanf. It teaches low-level string manipulation, memory management, and formatted I/O parsing. This builds critical skills for systems programming and developing efficient, reliable software tools.

The s21_matrix project implements a C library for matrix operations, including arithmetic, transformations, and advanced calculations like determinants and inverse matrices. It demonstrates core principles of structural programming and linear algebra essential for computational tasks and graphics programming. The solution is delivered as a static library with comprehensive unit test coverage.