Rail Fence Cipher

Challenge Overview

Implement encoding and decoding for the rail fence cipher.

Visit the rail-fence-cipher exercise on Exercism to read the full instructions and download the exercise files.

Community Solutions

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The following are the top 3 community solutions by stars:

Solution 1 by @aaronknudtson (⭐ 1) — View on Exercism
Solution 2 by @PrasanthM11 (⭐ 0) — View on Exercism
Solution 3 by @Arunkumarak (⭐ 0) — View on Exercism

Source: Exercism c/rail-fence-cipher

💡 View Solution

#include "rail_fence_cipher.h"

char *encode(char *text, size_t rails) {
  int length = strlen(text);
  // initiate rails
  char **data = malloc(sizeof(*data) * (int)rails);
  for (int i = 0; i < (int)rails; ++i) data[i] = malloc(sizeof(char) * length);
  for (int i = 0; i < (int)rails; ++i) {
    for (int j = 0; j < length; ++j) {
      data[i][j] = 0;