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void traverseDirectories(const char* directory_name, char gender[1], char firstname[20], char lastname[20]){

    DIR* dir = opendir(directory_name);
    int totalidx, startidx, endidx, z;

    if(dir == NULL){
        return;
    }

    struct dirent* entity;
    entity = readdir(dir);
    while(entity != NULL){
        if(entity->d_type == DT_DIR && strcmp(entity->d_name, ".") != 0 && strcmp(entity->d_name, "..") != 0){
            char path[100] = {0};
            strcat(path, directory_name);
            strcat(path, "/");
            strcat(path, entity->d_name);
            traverseDirectories(path);
            //printf("%s\n", entity->d_name);
        }

        else if(entity->d_type == DT_REG){
            FILE *entity_file;
            entity_file = fopen(entity->d_name, "r");
            char buffer[256];
            totalidx = 0;


            while(fgets(buffer, 256, entity_file)){
                startidx = 0;
                endidx = 0;

                for (int i = 0; i < strlen(buffer); i++){

                    if(buffer[i] == ' '){

                        char currentword[20];
                        z = 0;

                        for(int j = startidx; j < i; j++){
                            currentword[z] = buffer[j];
                            z++;
                        }
                        if(strcmp(currentword, firstname) == 0){
                            if(gender[0] == 'm' && buffer[startidx - 3] == 's'){
                                fseek(entity_file, startidx - 3, SEEK_SET);
                                fputs('r', fptr);
                            }
                            if(gender[0] == 'f' && buffer[startidx - 3] == 'r'){
                                fseek(entity_file, startidx - 3, SEEK_SET);
                                fputs('s', fptr);
                            }

                            if()
                        }
                        startidx = i + 1;
                    }
                }
                


                totalidx += strlen(buffer);
            }
        }

        entity = readdir(dir);
    }
    closedir(dir);
}