isGoldenRanking function
Returns whether a specific rank out of total qualifies for the academic award.
Requires positive rank and total, and rank must be within the award quota:
rank <= (total - 1) ~/ 20 + 1.
Implementation
bool isGoldenRanking({required int rank, required int total}) {
if (total <= 0 || rank <= 0) return false;
return rank <= getAwardQuota(total);
}