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Showing content from https://cplusplus.com/reference/cstring/strcat/ below:

function

strcat

char * strcat ( char * destination, const char * source );

Concatenate strings

Appends a copy of the source string to the destination string. The terminating null character in destination is overwritten by the first character of source, and a null-character is included at the end of the new string formed by the concatenation of both in destination.

destination and source shall not overlap.

Parameters

destination: Pointer to the destination array, which should contain a C string, and be large enough to contain the concatenated resulting string.
source: C string to be appended. This should not overlap destination.

Return Valuedestination is returned.

Example

/* strcat example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[80];
  strcpy (str,"these ");
  strcat (str,"strings ");
  strcat (str,"are ");
  strcat (str,"concatenated.");
  puts (str);
  return 0;
}

Output:

these strings are concatenated.