#include <stdio.h>
 
void cat_data(int* data1, const int* data2, int len2){
    int null_idx;
    for(int i = 0; i<7;i++){
        if(data1[i]==0){
            for(int j = 0; j<len2 ; j++){
		        data1[i + j] = data2[j];
		    }
            break;
        }
    }
 
 
}
int main(){
    int data1[7] = {11,22,33,44};
    int data2[5] = {3,4,5,6,7};
 
 
    cat_data(data1, data2, sizeof(data2)/sizeof(int));
 
    for(int i = 0; i < 7; i++){
        printf("data1[%d] = %d \n", i,data1[i]);
    }
    return 0;
}
 

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