The strcpy() function copies the string pointed to by src
(including the terminating `\0' character) to the array pointed to by
dest. The strings may not overlap, and the destination string
dest must be large enough to receive the copy.
The strncpy() function is similar, except that not more than n
bytes of src are copied. Thus, if there is no null byte among the first
n bytes of src, the result will not be null-terminated.
In the case where the length of src is less than that of n, the
remainder of dest will be padded with nulls.
If the destination string of a strcpy() is not large enough (that is, if
the programmer was stupid/lazy, and failed to check the size before copying)
then anything might happen. Overflowing fixed length strings is a favourite