简单的C代码，带有令人烦恼的“分配中不兼容的类型”错误

Just a simple program to get used to pointers. The program is supposed to put the contents of a portion of my memory into a character array in reverse order of how the memory is read. I.E. looking at descending memory address, and I want to store it in descending order in a character array.Just a simple program to get used to pointers.