void *memcpy(void *str1, const void *str2, size_t n); 

Copy a string into another variable important here is to give the size of the string

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
#include <string.h>
 
int main ( void )
{
  char source[20]="Test 1234 ! :D";
  char dest[20];
  memcpy (dest,source,strlen(source)+1);
  printf ("Value of Destination is %s\n",dest);
  return 0;
}

  output:
  user@host:~$ ./memcpy 
  Value of Destination is Test 1234 ! :D