Help me in solving PPSC278 problem

help
,
1

My issue

Problem is not solving it is coming failed in hidden test case

My code

void userFunction() {



    FILE *file = fopen("/mnt/codechef/input.txt", "r");   // Open the "input.txt" file for reading

    if (file == NULL) {
        perror("Error opening file");   // Print an error message if file opening fails
        return 1;   // Return an error code
    }

    char buffer[100];   // Buffer to store each line
    char *searchWord = "CodeChef";   // The word to search for
    int count = 0;   // Initialize a counter for occurrences

    // Update the code below to solve the problem
while (fgets(buffer,sizeof(buffer), file)!= NULL){
    char *found = strstr(buffer,searchWord);
    while (found !=NULL){
        count++;
        found=strstr(found+strlen(searchWord),searchWord);
    }
}
printf("Number of occurrences of 'CodeChef': %d\n", count);   // Print the total occurrences

    fclose(file);   // Close the file
}

Learning course: Programming and Problem solving using C
Problem Link: https://www.codechef.com/learn/course/ciet-programming-c/CIETPC37/problems/PPSC278