not open

#include<stdio.h>

int fib(int n);

int main() {
    int result = fib(6);
    printf("Fibonacci of 6 is: %d\n", result);
    return 0;
}

int fib(int n) {
    if (n == 0) {
        return 0;
    }
    if (n == 1) {
        return 1;
    }

    int fibNm1 = fib(n - 1);
    int fibNm2 = fib(n - 2);
    int fibN = fibNm1 + fibNm2;

    return fibN;
}
