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

int main() {
    char str1[100], str2[100];

    printf("Type the first string: \n");
    fgets(str1, sizeof(str1), stdin);
    str1[strcspn(str1, "\n")] = 0;

    printf("Type the second string: \n");
    fgets(str2, sizeof(str2), stdin);
    str2[strcspn(str2, "\n")] = 0;
    
    char* longer_string = (strlen(str1) >= strlen(str2)) ? str1 : str2;
    char* shorter_string = (strlen(str1) >= strlen(str2)) ? str2 : str1;

    char res_str[strlen(longer_string) * 2];

    for (int i = 0; i < strlen(longer_string); i++) {
        res_str[i*2] = str1[i];
        res_str[i*2+1] = str2[i];
    }

    for (int i = 0; i < strlen(longer_string) - strlen(shorter_string) + 1; i++) {
        res_str[2*strlen(shorter_string)+i] = longer_string[strlen(shorter_string)+i];
    }

    printf("Added strings: %s\n", res_str);

    return 0;
}