Trouble using Functions for Hangman game in C

I am trying to make a hangman gave using C Functions. I was able to make the game without using functions but now when i try to use functions i am running into a few problems.

The main problem i am having is in my displayWord() function. I need this function to print out the word to screen with all letters that have not been correctly guessed blanked out with an underscore.

~Header FiIles

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

/* Constants. */
#define NUM_WORDS 50
#define ALPHABET_SIZE 26
#define GOOD_GUESS 0
#define BAD_GUESS 1
#define GAME_OVER 1
#define GAME_CONTINUE 0
#define MAX_GUESS 10
#define MAX_WORD_LEN 10

/* Function prototypes. */
int init(char* word);
void displayWord(char* word, int* guessedLetters, int* length);
int guessLetter(char* word, int* guessedLetters);
void displayHangman(unsigned wrongGuesses);
int isGameOver(char* word, int* guessedLetters, unsigned wrongGuesses);
void readRestOfLine();

~Main Code

#include "hangman.h"

/****************************************************************************
* Function main() is the entry point for the program.
****************************************************************************/
int main(void)
{
   char word[MAX_WORD_LEN + 1];
   unsigned wrongGuesses = 0;
   int guessedLetters[ALPHABET_SIZE] = {
      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
   };
   int length = 0;

   int numLives = 10;
   int numCorrect = 0;
   int oldCorrect = 0;
   int lengthOfWord = 0;
   length = init(word);
   printf("length: %d\n", length);
   displayWord(word, guessedLetters, length);



   return EXIT_SUCCESS;
}


int init(char* word)
{
   srand(time(NULL));
   int randomIndex = rand() % 50;

   const char* words[NUM_WORDS] = {
      "array",      "auto",       "break",      "case",       "cast",
      "character",  "comment",    "compiler",   "constant",   "continue",
      "default",    "double",     "dynamic",    "else",       "enum",
      "expression", "extern",     "file",       "float",      "function",
      "goto",       "heap",       "identifier", "library",    "linker",
      "long",       "macro",      "operand",    "operator",   "pointer",
      "prototype",  "recursion",  "register",   "return",     "short",
      "signed",     "sizeof",     "stack",      "statement",  "static",
      "string",     "struct",     "switch",     "typedef",    "union",
      "unsigned",   "variable",   "void",       "volatile",   "while"
   };

    word = words[randomIndex];
    int lengthOfWord = strlen(words[randomIndex]);
    printf("Word: %s\n", words[randomIndex]);

    return lengthOfWord;



}

void displayWord(char* word, int* guessedLetters, int* length)
{

    int loopIndex;
    char gameWord[][1] = word;


    for ( loopIndex = 0; loopIndex < length; loopIndex++ ) {

        if(letterGuessed[loopIndex] == 1) {
            printf("%c",gameWord[0][loopIndex]);
        } else {
            printf("-");
        }

    }
}

I have no idea how to scan through my random word to print out the letters that have been guessed. I have tried a few different way from reading around the web and watching videos but i am really not sure. Please help.

Problem Code

void displayWord(char* word, int* guessedLetters, int* length)
{

    int loopIndex;
    char gameWord[][1] = word;


    for ( loopIndex = 0; loopIndex < length; loopIndex++ ) {

        if(letterGuessed[loopIndex] == 1) {
            printf("%c",gameWord[0][loopIndex]);
        } else {
            printf("-");
        }

    }
}