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`strncat'--concatenate strings

     #include <string.h>
     char *strncat(char *DST, const char *SRC, size_t LENGTH);
`strncat' appends not more than LENGTH characters from the string
pointed to by SRC (including the	terminating null character) to the end
of the string pointed to by DST.  The initial character of SRC
overwrites the null character at the end of DST.  A terminating null
character is always appended to the result
Note that a null is always appended, so that if the copy is limited by
the LENGTH argument, the number of characters appended to DST is `n +
This function returns the initial value of DST
`strncat' is ANSI C.
   `strncat' requires no supporting OS subroutines.