#include <stdio.h>
void pat(char *header, char *footer){
	while(*header != '\0'){
		++header;
	}
	while(*footer != '\0'){
		++header;
		*header = *footer;
		++footer;
		printf("%c", *footer);
	}
}

int main(void){
	char *header = "This is the end, my friend, ";
	char *footer = " the end.";
	pat(header, footer);
	while(*header != '\0'){
		printf("%c", *header);
		header++;
	}
}