Sort words

#define _CRT_SECURE_NO_WARNINGS

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

#define MAX_WORDS 50
#define WORD_LEN 20

int read_line(char str[], int n);
int compare_strings(const void* p, const void* q);

int main(void)
{
    char* words[MAX_WORDS], word[WORD_LEN + 1];
    int i, num_words = 0;
    for (;;) {
        if (num_words == MAX_WORDS) {
            printf("--No space left--\n");
            break;
        }
        printf("Enter a word: ");
        read_line(word, WORD_LEN);
        if (strlen(word) == 0) {
            break;
        }
        words[num_words] = malloc(strlen(word) + 1);
        if (words[num_words] == NULL) {
            printf("--No space left--\n");
            break;
        }
        strcpy(words[num_words], word);
        num_words++;
    }
    qsort(words, num_words, sizeof(char*), compare_strings);
    printf("\nIn sorted order : \n");
    for (i = 0; i < num_words; i++)
        printf(" %s\n", words[i]);
    printf("\n");

    // Free memory allocated for each word
    for (i = 0; i < num_words; i++)
        free(words[i]);

    return 0;
}

int read_line(char str[], int n)
{
    int ch, i = 0;

    while ((ch = getchar()) != '\n')
        if (i < n)
            str[i++] = ch;
    str[i] = '\0';
    return i;
}

int compare_strings(const void* p, const void* q)
{
    return strcmp(*(char**)p, *(char**)q);
}