#include <stdio.h>
#include <string.h>
#include <stdlib.h>

char **merge(FILE *file1, FILE *file2);
char **block;

int main(int argc, char const *argv[]){
    int max_lines = 100;
    int buffer_length = 100;
    char buffer[buffer_length];

    char **block = (char **)calloc(max_lines, sizeof(char *));
    for(int i = 0; i < max_lines; i++){
        block[i] = (char *)calloc(buffer_length, sizeof(char *));
    }

    FILE *file1;
    FILE *file2;
    FILE *file3;
    FILE *file4;
    if(argc >= 5){
        file1 = fopen(argv[1], "r");
        file2 = fopen(argv[2], "r");
        file3 = fopen(argv[3], "r");
        file4 = fopen(argv[4], "r");
    }

    int *blocks = (int *)calloc(3, sizeof(int*));
    blocks[0] = merge(file1, file2);
    blocks[1] = merge(file3, file4);
    return 0;

}

char **merge(FILE *file1, FILE *file2){
    int max_lines = 100;
    int buffer_length = 100;
    char buffer[buffer_length];

    char **block = (char **)calloc(max_lines, sizeof(char *));
    for(int i = 0; i < max_lines; i++){
        block[i] = (char *)calloc(buffer_length, sizeof(char *));
    }

    int index = 0;
    while(fgets(buffer, buffer_length, file1)){
        strcpy(block[index], buffer);
        index += 2;
    }

    index = 1;
    while(fgets(buffer, buffer_length, file2)){
        strcpy(block[index], buffer);
        index += 2;
    }

    for(int i = 0; i < index; i++){
        printf(block[i]);
    }
    return block;
}