Reversing strings in C

char word[]="hello";
/*
so the characters...
*/
word[0] = 'h', word[1] = 'e', word[2] = 'l', word[3] = 'l', word[4] = 'o'
/*
if you want to reverse that, what's the simplest way? ...::cough cough:: _index_ ::cough::
*/
word[4] = 'o', word[3] = 'l', ...
/*
Of course, you can add loops to make that more efficient code

Now to add the 'x' character, well, that's easy too... just transfer onto a larger array and add those extra characters into it...  to make it a bit more flexible, look at dynamic memory allocation of character arrays using malloc() and free()
*/