strncat
#include <stdio.h>
#include <string.h>
int main () {
char src[50], dest[50];
strcpy(src, "This is source");
strcpy(dest, "This is destination");
strncat(dest, src, 15);
printf("Final destination string : |%s|", dest);
return(0);
}
output:
Final destination string : |This is destinationThis is source|