refactor(all): Fixed alloc and moved growing logic to another function

OK, so evrything was a fucknig mess, it still kinda is, AI helped
me to clean my own mess, it really sucks but the fucking debugger
and address sanitizer were not working, also, there were small
small errors so no big deal but still, a bit sad, also changed a
the way i cast from uint8_t to double and int in the tests, may
change that i guess, verything else i might say is good :)

test/CMakeLists.txt

@@ -7,4 +7,9 @@ target_link_libraries(test_arena
     cmocka::cmocka
 )
 
+enable_sanitizers(test_arena)
+
+target_compile_options(test_arena PRIVATE -fsanitize=address -fno-omit-frame-pointer)
+target_link_options(test_arena PRIVATE -fsanitize=address)
+
 add_test(NAME arena_tests COMMAND test_arena)