Aliasing

Aliasing is when different symbolic names can access to the same object that is stored in the memory. This could be a hassle for 202203011139#.

In C programming, all base types except char does not support aliasing.

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restrict

ptr1 cannot be at the same time pointing to the object that is pointed by ptr2. This is a known pattern in order to constrain the 202205171500#.
register

The side effect of the identifier register is that it could avoid 202205171500# for variables in the function scope.
C Hygiene

Avoid taking local variables addresses using & operator as this will inhibit 202205171500# which is great in 202203011139#. See 202205171504.