The memccpy function operates on strings in memory areas. A
    memory area is a group of contiguous characters bound by a count
    and not terminated by a null character. The function does not
    check for overflow of the receiving memory area. The memccpy
    function is defined in the <string.h> header file.

    The memccpy function sequentially copies characters from the
    location pointed to by source into the location pointed to by
    dest until one of the following occurs:

    o  The character specified by c (converted to an unsigned char)
       is copied.

    o  The number of characters specified by n is copied.