How to use test-driven development in C as beginner in programming

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16. int sum_of_multiples(int border){
int sum = 0;
// calculate something
return sum;
}

17. void test(int output,int expected){
if(output == expected)
printf("Test:t successn");
else
printf("Test:t failn");
}

18. int main(void){
test(sum_of_multiples(4),3);
return 0;
}

20. int sum_of_multiples(int border){
int sum = 0;
// calculate something
for(int i=1; i<border; i++){
if(i%3==0) sum += i;
}
return sum;
}

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23. int sumMultiplesOf3and5(int border){
int sum = 0;
// calculate something
for(int i=1; i<border; i++){
if(i%3==0) sum += i;
}
return sum;
}

24. int sumMultiplesOf3and5(int border){
int sum = 0;
for(int i=1; i<border; i++){
if(i%3==0) sum += i;
}
return sum;
}

26. int main(void){
test(sumMultiplesOf3and5(4),3);
test(sumMultiplesOf3and5(10),21);
return 0;
}

28. int sumMultiplesOf3and5(int border){
int sum = 0;
for(int i=1; i<border; i++){
if(i%3==0 || i%5==0) sum += i;
}
return sum;
}

30. int main(void){
test(sumMultiplesOf3and5(4),3);
test(sumMultiplesOf3and5(10),21);
test(sumMultiplesOf3and5(100),2318);
return 0;
}