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    int gemstones(int arr_count, char** arr) {
        char* ok = NULL;
        int pres = 0, dragon = 0;
        for(char i = 'a';i <= 'z';i++) {
            for(int j = 0;j < arr_count;j++) {
                ok = strchr(arr[j],i);
                if(ok != NULL) {
                    pres++;
                }
                ok = NULL;
            }
            if(pres == arr_count) {
                dragon++;
            }
            pres = 0;
        }
        free(ok);
        return dragon;