Declaration:
char *strncat(char *str1,
const char *str2, size_t
n);
Appends the string pointed to by str2 to the end of
the string pointed to by str1 up to n
characters long. The terminating null character of str1
is overwritten. Copying stops once n characters are
copied or the terminating null character of str2 is
copied. A terminating null character is always appended to
str1. If overlapping occurs, the result is undefined.
The argument str1 is returned.
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