chore: refactor Makefile

style: one declaration per line in tests

test: use s21_fill_matrix helper in tests

fix: zero result struct on s21_create_matrix failure

fix: validate result as output param in s21_sum/sub_matrix

earliema: fix: unsigned cast before bit shift

earliema: fix: else braces, char to int, dead assignment, comment

earliema: fix: loop condition in s21_number_of_digit

lcov -c -d . --base-directory . --no-external

earliema: refactor: rewrite Makefile

Fixed test_s21_sprintf_large_float so that it passes under valgrind

Fix always true conditions

Change to earliema %g/%G

Change to earliema int p_sp implementation

reduced nesting: void point_change

style(grep): improve code formatting in options.c

Merge remote-tracking branch 'origin/develop' into develop

refactor(grep): decompose process.c and options.c per structural programming principles

refactor(cat): decompose process.c according to structural programming principles

tests(cat): add cleanup of temporary test artifacts in run_cat_tests.sh