C LANGUAGE:::

int gemstones(int arr_count, char arr) {
    int alphbetical_array[26]={0};
    for(int i=0;i<arr_count;i++){
        int temp_alphaArrray[26]={0};// temporary array used to find duplicate minerals
        for(int j=0;arr[i][j]!='\0';j++){
            // if temp_alphaArray has already a mineral, it doesn't execute
            if(!(temp_alphaArrray[arr[i][j]-'a'])){ // used for a single mineral once
                temp_alphaArrray[arr[i][j]-'a']++;
                alphbetical_array[arr[i][j]-'a']++;
            }
        }
    }
    
    int count=0;
    for(int i=0;i<26;i++){
        if(alphbetical_array[i]==arr_count){
            count++;
        }
    }
    
    return count;
}**