C program to compare two strings without using library function

Write a C program to compare two strings without using built-in function(strcmp).

  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  int main() {
        char str1[64], str2[64], i = 0, flag = 0;

        /* get the first input string */
        printf("Enter your 1st string:");
        fgets(str1, 64, stdin);
        str1[strlen(str1) - 1] = '\0';

        /* get the second input string */
        printf("Enter your 2nd string:");
        fgets(str2, 64, stdin);
        str2[strlen(str2) - 1] = '\0';

        /* compare lenght of two strings */
        if (strlen(str1) != strlen(str2)) {
                printf("Both string are not equal\n");
                return;
        }

        /* compare each and every character in both string */
        while (str1[i] != '\0') {
                if (str1[i] != str2[i]) {
                        flag = 1;
                        break;
                }
                i++;
        }

        /* print the result */
        if (flag)
                printf("Both strings are not same\n");
        else
                printf("Both strings are same\n");
        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your 1st string  : HelloWorld
  Enter your 2nd string : HelloWorld
  Both strings are same