Simple print format

/*
  compile with 'gcc source.c -o q1 -Wall -m32'
*/


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

#define PASS_SIZE 12
#define ATTEMPTS 3
#define NO 0
#define YEP 1

void checkadmin(void);
void get_guess(char *str, char *guess);
void get_password(char *password);

int main(int argc, char *argv[]){

        fflush(stdout);
        checkadmin();
        return EXIT_SUCCESS;
}

void checkadmin(void){
        char guess[PASS_SIZE + 1];
        char password[PASS_SIZE];
        char response[100];
        get_password(password);

        printf("What's the password?\n");
printf(password);

        int i = 0;
        int correct = NO;
        for (i = 0; i < ATTEMPTS; ++i) {
                get_guess("Password:", guess);
                sprintf(response, "You guessed: %s\n", guess);
                fprintf(stdout, response);
                if (strncmp(guess, password, PASS_SIZE) == 0){
                        correct = YEP;
                        break;
                }else{
                        printf("Incorrect! Atempts remaining: %d\n", ATTEMPTS - i -1);
                }
        }

        if (correct == YEP){
                printf("WIN\n");
        }else{
                printf(":-(\n");
        }
        fflush(stdout);
}


void get_password(char *password){
        int i = 0;
        char c;
        FILE *rand = fopen("/dev/urandom", "r");
        while (i < PASS_SIZE){
                c = getc(rand);
                if (((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')) && !( c == 'n' || c == 'N' || c == 's' || c == 'S' )){
                        password[i++] = c;
                }
        }
}

/*
        Get a guess from a prompt
*/
void get_guess(char *str, char *guess){
        int i;
        /* Prompt user for input */
        printf("%s", str);
        fflush(stdout);

        /* Read user input */
        fgets(guess, PASS_SIZE + 1, stdin);

        /* Ensure that input is valid */
        for(i = 0; i < PASS_SIZE; i++){ // skip the possible -ve sign
                if( guess[i] == 'n' || guess[i] == 'N' || guess[i] == 's' || guess[i] == 'S' ){
                        printf("Invalid guess:%s\n", guess);
                        return get_guess(str, guess);
                }
        }
        guess[PASS_SIZE] = '\0';
        return;
}