Large Factorials (code wars) in C language.

Large Factorials (code wars) in C language.

include<stdio.h>
#include <stdlib.h>
#include <string.h>
    int main(int argc, char const *argv[])
{
    factorial(5);
    return 0;
}

char *factorial(int n)
{
    if (n < 0)
    {
        return "";
    }
    unsigned long long int fact = 1;
    for (int i = 1; i <= n; i++)
    {
        fact *= i;
    }
    char *result = malloc(sizeof(char) * 100);
    sprintf(result, "%llu", fact);

    return result;
}