#include <stdio.h>
 
void cat_data(int *data1,const int *data2,int len2){
 
	int data1_initial_length=2;
 
	for(int i=0;i<len2;i++){
 
		data1[data1_initial_length+i]=data2[i];
	}
 
 
}
 
int main(void) {
 
	int data1[7]={1,2};
 
	const int data2[5]={3,4,5,6,7};
 
	int len2 = sizeof(data2)/sizeof(data2[0]);
 
	cat_data(data1,data2,len2);
 
	printf("\n");
 
	for(int i=0;i<7;i++){
		printf("data1[%d]=%d\n",i,data1[i]);
	}
 
 
 
	return 0;
}
 

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