СИ - выделенная память

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The order and contiguity of storage allocated by successive calls to the calloc,
malloc, and realloc functions is unspeci?ed. The pointer returned if the allocation
succeeds is suitably aligned so that it may be assigned to a pointer to any type of object
and then used to access such an object or an array of such objects in the space allocated
(until the space is explicitly deallocated). The lifetime of an allocated object extends
from the allocation until the deallocation. Each such allocation shall yield a pointer to an
object disjoint from any other object. The pointer returned points to the start (lowest byte
address) of the allocated space. If the space cannot be allocated, a null pointer is
returned. If the size of the space requested is zero, the behavior is implementation-
de?ned: either a null pointer is returned, or the behavior is as if the size were some
nonzero value, except that the returned pointer shall not be used to access an object.