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Hash table nebudu implementovat, na to nemám čas, ale algoritmus generování jsem ti napsal, uprav si to podle zadání.

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

#define WORD_MIN_LEN 1
#define WORD_MAX_LEN 10

#define WORDS_COUNT 500

int
main (void)
{
	char words[WORDS_COUNT * (WORD_MAX_LEN + 1)];
	unsigned int rnd_w_len, rnd_w_char, words_buff_pos;
	int i, j;

	srand (time (NULL));

	memset (words, 0, sizeof (words));

	words_buff_pos = 0;

	for ( i = 0; i < WORDS_COUNT; i++ ){
		// Generate random length within range
		rnd_w_len = rand () % (WORD_MAX_LEN - WORD_MIN_LEN + 1) + WORD_MIN_LEN;

		fprintf (stderr, "Generating a word of length: %u B\n", rnd_w_len);

		for ( j = 0; j < rnd_w_len; j++ ){
			// Generate a random character in range 97 - 122 (ASCII lowercase alphabet)
			rnd_w_char = rand () % (122 - 97 + 1) + 97;
			
			words[words_buff_pos++] = rnd_w_char;
		}
		
		words[words_buff_pos++] = '\0';
	}

	fprintf (stderr, "Generated words:\n");

	words_buff_pos = 0;

	for ( i = 0; i < WORDS_COUNT; i++ ){
		fprintf (stdout, "%s\n", words + words_buff_pos);

		words_buff_pos += strlen (words + words_buff_pos) + 1;
	}


	return EXIT_SUCCESS;
}