[C] Zapamiętywanie łańcuchów znakowych

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


struct WordList
{
    char *word;
    struct WordList *next;
};


void loadData(struct WordList **wordListPointer)
{
    char newWord[32];
    (*wordListPointer)->next = NULL;
    printf("Wprowadz wyraz: ");
    scanf("%s", newWord);
    (*wordListPointer)->word = (char*)malloc(sizeof(char) * strlen(newWord));
    strcpy((*wordListPointer)->word, newWord);
}


void addWord(struct WordList **headPointer)
{
    struct WordList *pointer;

    pointer = *headPointer;
    if (pointer == NULL)
    {
        pointer = (struct WordList*)malloc(sizeof(struct WordList));
        loadData(&pointer);
        *headPointer = pointer;
    }
    else
    {
        while(pointer->next != NULL)
        {
            pointer = pointer->next;
        }
        pointer->next = (struct WordList*)malloc(sizeof(struct WordList));
        pointer = pointer->next;
        loadData(&pointer);
    }
}


char *convertToUpper(char *string)
{
    int stringLength, i;
    char *newString;

    stringLength = strlen(string);
    newString = (char*)malloc(sizeof(char)*(stringLength + 1));
    for(i = 0; i < stringLength; i++)
    {
        newString[i] = toupper((int)string[i]);
    }
    return newString;
}


void findWords(struct WordList *headPointer, struct WordList **firstAlphabetically, struct WordList **lastAlphabetically)
{
    *firstAlphabetically = NULL;
    *lastAlphabetically = NULL;


    if (headPointer != NULL)
    {
        *firstAlphabetically = headPointer;
        *lastAlphabetically = headPointer;

        while (headPointer->next != NULL)
        {
            headPointer = headPointer->next;
            if (strcmp(convertToUpper((*firstAlphabetically)->word), convertToUpper(headPointer->word)) > 0)
            {
                *firstAlphabetically = headPointer;
            }
            if (strcmp(convertToUpper((*lastAlphabetically)->word), convertToUpper(headPointer->word)) < 0)
            {
                *lastAlphabetically = headPointer;
            }
        }
    }
}


int main()
{
    struct WordList *head, *firstAlphabetically, *lastAlphabetically;
    int numberOfWords, i;



    head = NULL;
    printf("Wprowadz liczbe wyrazow: ");
    scanf("%d", &numberOfWords);

    for (i = 0; i < numberOfWords; i++)
    {
        addWord(&head);
    }

    findWords(head, &firstAlphabetically, &lastAlphabetically);

    printf("%s\n%s", firstAlphabetically->word, lastAlphabetically->word);


    return 0;
}