Help me in solving EZSPEAK problem

help
,
1

My issue

find the error

My code

#include <stdio.h>
#include <string.h>
int is_easy_to_pronounce(char *S, int l) {
    int consecutive_consonants = 0;
    const char vowels[] = "aeiou";
    for (int i = 0; i < l; i++) {
        if (strchr(vowels, S[i]) != NULL) {
            consecutive_consonants = 0; 
        } else {
            consecutive_consonants++; 
            if (consecutive_consonants >= 4) {
                return 0; 
            }
        }
    }
    return 1; 
int main() {
    int k;
    scanf("%d", &k); 

    while (k--) {
        int l;
        char S[101];

        scanf("%d", &l); 
        scanf("%s", S);  
        if (is_easy_to_pronounce(S, l)) {
            printf("YES\n");
        } else {
            printf("NO\n");
        }
    }

    return 0;
}
}

Learning course: Roadmap to 3*
Problem Link: https://www.codechef.com/learn/course/klu-roadmap-3star/KLURMP300A/problems/EZSPEAK