ReverseWords

void ReverseWords(char s[])
{
    int i=0,k=0;
    while(s[i]!='\0')
    {
        if(s[i]!=' ')
            ++k;
        else
        {
            int p=1;
            if(k%2)
                for(int j=i-k;j<=i-k+k/2;++j)
                    swap(s[j],s[i-p]),++p;
            else
                for(int j=i-k;j<i-k+k/2;++j)
                    swap(s[j],s[i-p]),++p;
            k=0;
        }
        ++i;
    }
    int p=1;
    if(k%2)
        for(int j=i-k;j<=i-k+k/2;++j)
            swap(s[j],s[i-p]),++p;
    else
        for(int j=i-k;j<i-k+k/2;++j)
            swap(s[j],s[i-p]),++p;
    for(int j=0;j<i/2;++j)
        swap(s[j],s[i-j-1]);
}