pub fn select_enrolment<'a>(
enrolments: &'a [SuotarEnrolment],
criteria: EnrolmentCriteria<'_>,
) -> Result<&'a SuotarEnrolment, NoUsableEnrolment>pub fn select_enrolment<'a>(
enrolments: &'a [SuotarEnrolment],
criteria: EnrolmentCriteria<'_>,
) -> Result<&'a SuotarEnrolment, NoUsableEnrolment>