What is the difference between the functions memmove() and
memcpy()?

• With memcpy, the destination cannot overlap the source at all. With memmove it can.
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• Memmove() functions are those functions which are used for moving changes in the memory,
  whereas memcpy() are those which do the copying of memory.
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• In memmove() the source memory of specific size is copied into buffer and then moved to destination.As a result, overlapping is done successfully.
  In memcpy() there is no extra buffer taken for source memory. The copying is done directly on the memory. As a result, overlapping may give unexpected results.
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