#include <stdio.h>
 
void cat_data(int*data1, const int*data2, int len2);
 
int main(void) {
	int data1[7]={1, 2};
	int data2[5]={3, 4, 5, 6, 7};
	int len2=5;
 
	cat_data(data1, data2, len2);
 
	for(int i=0; i<7; i++){
		printf("data1[%d] = %d\n", i, data1[i]);
	}
 
	return 0;
}
 
void cat_data(int*data1, const int*data2, int len2){
	int i = 0;
 
	while(i<7&&data1[i]!=0){
		i++;
	}
 
	int j=0;
 
	while(i<7&&j<len2){
		data1[i]=data2[j];
		i++;
		j++;
	}
}
 

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