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strcat, strncat - concatenate two strings
char *strcat(char *dest, const char *src);
char *strncat(char *dest, const char *src, size_t n);
The strcat() function appends the src string to the dest string
overwriting the `\0' character at the end of dest, and then adds a
terminating `\0' character. The strings may not overlap, and the dest
string must have enough space for the result.
The strncat() function is similar, except that only the first n
characters of src are appended to dest.
The strcat() and strncat() functions return a pointer to the resulting
SVID 3, POSIX, BSD 4.3, ISO 9899
bcopy(3), memccpy(3), memcpy(3), strcpy(3), strncpy(3)