Segmentation fault when accessing strings from linked list - c

Question

I am trying to write a program that counts how many times a word is used in a text document. To do this I created a function called wordList that creates a linked list with a node for each word. Unfortunately, whenever I try to read a word from the linked list with printf there is a segmentation fault. I believe this is because the linked list is not actually copying any of the words. I am wondering how I can resolve this issue. At the moment I do not know how to proceed. Thanks:)
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
struct Node {
int timesUsed;
char* word;
struct Node* next;
};
struct Node* wordList(FILE *fp, struct Node* head);
struct Node* createNode(struct Node* head, char* word);
char* title(char* file);//creates file name based on command line input
int main(int argc, char** argv){
//Access file information---------------------------------------------
FILE *fp;
char* fileName = title(argv[1]);
fp = fopen(fileName, "r");
//Define Head node--------------------------------------------------------
struct Node* head = (struct Node*)malloc(sizeof(struct Node));
if (head == NULL){
printf("there is not enough memory on your device to continue\n");
}
//Access words--------------------------------------------------------
head = wordList(fp, head);
printf("%s\n",head->word);
free(head);
free(fileName);
return 0;
}
//Function that is causing problems==================================
struct Node* wordList(FILE *fp, struct Node* head){
char c;
char wordHolder[1240];//characters
int j = 0;
int count = 0;
do{
c = getc(fp);
printf("%c\n",c);
if(isalpha(c) || isdigit(c) || c == '\''){
wordHolder[j] = c;
j++;
}
else{
if(count){
char* tempWord = strdup(wordHolder);
head->word = tempWord;
head->timesUsed = 1;
head->next = NULL;
count = 1;
j = 0;
for(i = 0; i< strlen(wordHolder); i++){
wordHolder[i] = '\0';
}
}
else{
head = createNode(head, wordHolder);
j = 0;
for(i = 0; i< strlen(wordHolder); i++){
wordHolder[i] = '\0';
}
}
}
}
while(c != EOF);
return head;
}
//Creates a new node at end of list=====================================
struct Node* createNode(struct Node* head, char* word){
struct Node* temp = head;
while(temp != NULL){
temp = temp->next;
}
temp = (struct Node*)malloc(sizeof(struct Node));
temp->timesUsed = 1;
char* tempWord = strdup(word);
temp->word = tempWord;
temp->next = NULL;
return head;
}
//Creates fileName======================================
char* title(char* file){
char nameOfFile[500];
strcpy(nameOfFile, file);
strcat(nameOfFile, ".txt");
char* temp;
temp = strdup(nameOfFile);
if(temp == NULL){
printf("Your computer has litte memory.\n");
}
return temp;
}