C (Си): Функции в Си

#include "greatest.h"
#include "main.c"

TEST test_base(void) {
    char *format = "%d";
    ASSERT_EQ_FMT(2927, kelvin_to_celcius(3200), format);
    ASSERT_EQ_FMT(-546, kelvin_to_celcius(-273), format);
    ASSERT_EQ_FMT(-273, kelvin_to_celcius(0), format);
    PASS();
}

GREATEST_MAIN_DEFS();

int main(int argc, char **argv) {
    GREATEST_MAIN_BEGIN();
    RUN_TEST(test_base);
    GREATEST_MAIN_END();
}