int compare(char s1[], char s2[]){
        for(int i=0;s1[i]!='/0';i++)
        {
            if(s1[i]>'A'&&s1[i]<'Z')
                s1[i]=s1[i]-'A'+'a';
        }
        for(i=0;s2[i]!='/0';i++)
        {
            if(s2[i]>'A'&&s2[i]<'Z')
                s2[i]=s2[i]-'A'+'a';
        }
        for(i=0;s1[i]!='\0'&&s2[i]!='\0';i++){
            if(s1[i]>s2[i])
                return 1;
            else if(s1[i]<s2[i])
                return -1;
            else
                continue;
        }
        if(s1[i]=='\0'&&s2[i]=='\0')
            return 0;
        else if(s1[i]!='\0'&&s2[i]=='\0')
            return 1;
        else
            return -1;
}