This is very similar to my solution great thinking!

I'm relatively new to C++ katas. I dont have a negative opinion on the point values. it's all good practice in my book

it is okay to use external header files for solving these katas correct? I haven't programmed in C++ in some time.

does anyone thing using <cstring> would be incorrect for this kata?

Does anyone have the Sample Tests for this Kata? I seem to have deleted them by mistake

I have my Tests Passing with

Time: 592ms Passed: 19 Failed: 0
Test Results:
 Basic
 Basic tests (6 of 6 Assertions)
 Test prime (5 of 5 Assertions)
 Test not prime (8 of 8 Assertions)
Completed in 1.84ms
You have passed all of the tests! :)

but I am getting this Error when Running my attempt:

Passed: 0 Failed: 1 Errors: 1 Exit Code: 1
Test Results:
Execution Timed Out
 STDERR
Execution Timed Out (12000 ms)