c/exercises/practice/sieve/.approaches/array-of-ones-and-zeros/content.md at 0a3b7bce664184ad7935ab4b1f782b09837a366b · exercism/c · GitHub uses exercism/warning which isn’t a supported custom code block type. This should probably be exercism/caution.
The interesting bit is that https://exercism.org/tracks/c/exercises/sieve/approaches/array-of-ones-and-zeros errors out so that’ll need to looked at too.