Made some changes to make the declaration of pointers and how they are used more easily understood. Additionally modified the explanation regarding the '&' dereferencing operator.
* Added 'Pointer to pointer' section
The 'Pointer to pointer' section describe what is pointer to pointer with an example.
* Update index.md
Changed Output header to ####
* Update index.md
I added void pointers, which can be very useful in C programming, especially when dealing with unknown data types but had not been included.
* fixed formatting issues, removed attributions, moved placement to more appropriate location
* adjusted section header size