strcat, strncat - concatenate two strings
#include <string.h>
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
string dest.
SVID 3, POSIX, BSD 4.3, ISO 9899
bcopy(3), memccpy(3), memcpy(3), strcpy(3), strncpy(3)
GNU 1993-04-11 STRCAT(3)
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