Optimal way to perform a shift operation on an array

Question

Suppose I have an array

unsigned char arr[]= {0,1,2,3,4,5,6,7,8,9};

Is there a way to perform shift operation on them besides just copying them

Answer 1

If you're the only person with a pointer to the array, just increment the pointer and decrement the length.

Just remember to keep the original pointer around for when you free it.