#include <fmt/core.h>
#include <vector>
void print_number_at(const std::vector<int>& numbers, size_t at) {
fmt::println("number: {}", numbers[at]);
}
void print_numbers(const std::vector<int>& numbers) {
for(size_t i = 0; i != numbers.size(); i+=3) {
print_number_at(numbers, i);
}
}
int main() {
std::vector numbers{1,2,3,4};
print_numbers(numbers);
}