#include <stdio.h>
 
void cat_data(int data1[], int data2[], int len1, int len2) {
    int i;
    for(i = 0; i < len2; i++) {
        data1[len1 + i] = data2[i];
    }
}
 
int main(void) {
    int data1[7] = {1, 2, 3, 4, 5, 6, 7};  
    int data2[5]  = {8, 9, 10, 11, 12};    
 
    int len1 = 7;
    int len2 = sizeof(data2) / sizeof(data2[0]);  
 
    cat_data(data1, data2, len1, len2);
 
    for(int i = 0; i < len1 + len2; i++) {
        printf("%d ", data1[i]);
    }
    printf("\n");
 
    return 0;
}

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