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`strcat'--concatenate strings

     #include <string.h>
     char *strcat(char *DST, const char *SRC);
`strcat' appends a copy of 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.
This function returns the initial value of DST
`strcat' is ANSI C.
   `strcat' requires no supporting OS subroutines.