Build concept exercises + fix concept exercise that does not build.#915

Merged

vaeng merged 12 commits intoexercism:mainfrom heijp06:test_concept_exercises

Oct 16, 2024

+29-29

Commits on Oct 6, 2024

Fix: 'error: narrowing conversion of ‘ceil(after_discount)’ from ‘double’ to ‘int’ [-Werror=narrowing]' caused by list initialization syntax converting a double to int.
heijp06
committed

Commits on Oct 10, 2024

Commits on Oct 11, 2024