Initial commit

.gitignore

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+.DS_Store
+.idea
+*.log
+a.out
+tmp/

cherry.c

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+#include "cherry.h"
+#include <string.h>
+
+void cherry_encrypt(char cherry[], char crystal[], int mask[]) {
+  int i;
+  for (i = 0; i < strlen(cherry) - 1; i++) {
+    mask[i] = cherry[i] - crystal[i];
+  }
+  for (i = strlen(cherry) - 1; i < strlen(crystal) - 1; i++) {
+    mask[i] = crystal[i];
+  }
+}
+
+void cherry_decrypt(char cherry[], char crystal[], int mask[], int length) {
+  int i, end = 1;
+  for (i = 0; i < length; i++) {
+    if (i == strlen(cherry) - 1 || end == 0) {
+      crystal[i] = mask[i];
+      end = 0;
+    } else {
+      crystal[i] = cherry[i] - mask[i];
+    }
+  }
+}

cherry.h

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+#ifndef CHERRY_H_
+#define CHERRY_H_
+
+void cherry_encrypt(char cherry[], char crystal[], int mask[]);
+void cherry_decrypt(char cherry[], char crystal[], int mask[], int);
+
+#endif // CHERRY_H_

example.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "cherry.h"
+
+
+int main(int argc, char *argv[]) {
+  const int size = 1028;
+  char cherry[size], cherry2[size], crystal[size], crystal2[size];
+  int mask[size], mask2[size], i;
+  int length = 0;
+  puts("Enter the Cherry: ");
+  fgets(cherry, size, stdin);
+  puts("Enter the Crystal: ");
+  fgets(crystal, size, stdin);
+  cherry_encrypt(cherry, crystal, mask);
+  for (i = 0; i < strlen(crystal) - 1; i++) {
+    printf("%d ", mask[i]);
+    length++;
+  }
+  printf("\nYour mask is : %d characters long", length);
+  puts("\n===Decryption: ===\n");
+  puts("Enter the Cherry: ");
+  fgets(cherry2, size, stdin);
+  puts("Enter the size of the Mask: ");
+  scanf("%d", &length);
+  puts("Enter the mask: ");
+  for (i = 0; i < length; i++) {
+    scanf("%d", &mask2[i]);
+  }
+  puts("The Crystal is: ");
+  cherry_decrypt(cherry2, crystal2, mask2, length);
+  puts(crystal2);
+  return 0;
+}