help with hangman arrays

#include<stdio.h>
#include<stdlib.h>
#define letters 80

main()
{
    char word[letters] = {'t','r', 'i', 'c', 'k'};
    char spaces[letters] = {'-', '-', '-', '-', '-'};
    char used[USED] = {' ', ' ',' ',' ',' ',' ',' '};
    int startmenu, PlayGame, ExitGame;
    int lives = 6;
    int i;
    int j = 0;

    int correct;
    char symb;
    int length = 5;
    printf("Lets PLay Hangman!");
    printf("\n1. Play game\n0. Exit");
    scanf("%d",&startmenu);

    switch( startmenu )// Menu that gives the user the option to play or not

    {

        case 1:
        {

            for(i=0; i < length ; i++)
            {
                word[length]=0;
            }
            word[length] = 0;
            printf("%c", spaces);
            while ((lives>0) && (j < length))
            {
                correct = 0;
                printf("Please enter a letter: ");
                do
                {
                    scanf("%c", &symb);
                    if((symb > 32) && ((symb < 97) || (symb > 122))) // Ascii table used for error cheching
                    {
                        printf("Invalid character\nEnter a letter: ");
                    }
                }while((symb < 97) || (symb > 122));
                for(i=0; i<length; i++)
                {
                    if(symb == word[i])
                    {
                        printf("This character has been used already\n");//I did not include used characters in my flowchart but im adding it in as an extra error check
                        break;
                    }
                }
                if(i == length)
                {
                    for(i=0;i < length;i++)
                    {
                        if(symb == word[i])
                        {
                            word[i] = symb;
                       
                            correct = 1;
                            printf("That was correct:D you have %i lives left.\n");
                            printf("You have %s\n",spaces);
                        }
                    }
                    if(correct == 0)
                    {
                        lives--;
                        if(lives > 0)
                        {
                            printf("Sorry that was not right! %i lives left.\n",lives);
                        }
                        else
                        {
                            printf("Sorry You lost! :(\n");
                        }
                        printf("You have %s\n",word);
                    }
                }
            }




        }
        case 0:
        {
            return 0;
        }//end case 0
    }
    getchar();
    getchar();
}