Tasks.md

@@ -282,53 +282,12 @@ Use [regex101.com](https://regex101.com) if you are not already a REGEX expert.
 
 There should be $374$ matches.
 
-A regex that matches the requirements is `\b[a-z][AEIOUaeiou]([a-w]|[A-W])`.
+A regex that fullfills the requirements is `\b[a-z][AEIOUaeiou]([a-w]|[A-W])`.
 
 [Code Example](src/tasks/regex.py)
 
 </details>
 
-## Ancient Cryptography
-
-Difficulty: 2/5
-
-<details>
-<summary>Text</summary>
-
-```text
-Neovim is a refactor, and sometimes redactor, in the tradition of Vim (which itself derives from 
-Stevie). It is not a rewrite but a continuation and extension of Vim. Many clones and derivatives 
-exist, some very clever—but none are Vim. Neovim is built for users who want the good parts of 
-Vim, and more. 
-````
-
-</details>
-
-1. The text above has been cyphered with the Caesar cipher, a timeless classic
-   algorithm to abstract the meaning away from a text and arguably an early
-   form of encryption. Your task is to decipher it back into readable text.
-
-### The Caesar cipher
-
-For the Caesar cipher, all letters are shifted by the value of the key.
-
-**Examples**
-
-`foo Bar` becomes `gpp Cbs` when shifted by $1$.
-
-
-
-<details>
-<summary>Hints</summary>
-
-</details>
-<details>
-<summary>Solution</summary>
-
-[Code Example](src/caesar.py)
-
-</details>
-
 ## Making a Hexeditor
 
 In this section, we're building a little hexeditor. You will be able to install
@@ -357,7 +316,7 @@ Difficulty: 2/5
 
 
 1. Dump the data of [data/metasyntactic.md](./data/metasyntactic.md) -- In
-   Hexadecimal.
+   Hexadecumal.
 2. Make the dumped Bytes look pretty, something like the example below:
 
 <details>
@@ -388,4 +347,18 @@ Line      Data
 0000110 ┃ 6d20 7465 7361 6e79 6174 7463 6369 7620
 ...
 ```
+
+<details>
+<summary>Hints</summary>
+
+TODO: add hints
+
+</details>
+<details>
+<summary>Solution</summary>
+
+TODO: formulate solution text
+
+[Code Example](src/tasks/hexdumper-a.py)
+
 </details>

src/caesar.py

@@ -1,46 +0,0 @@
-#!/usr/bin/env python3
-import sys
-
-def internal(text: str, key: int) -> str:
-    cyphertext: str = ""
-    for c in text:
-        if ord(c) >= 65 and ord(c) <= 90: # uppercase letters
-            ci = ord(c) - ord('A')
-            add = ord('A')
-            #print(f"{c} is uppercase")
-        elif ord(c) >= 97 and ord(c) <= 122: # uppercase letters
-            ci = ord(c) - ord('a')
-            add = ord('a')
-            #print(f"{c} is lowercase")
-        else:
-            #print(f"not a letter: {c} ({ord(c)})")
-            # character is not a letter, just skip it
-            cyphertext += c
-            continue
-        ci += key
-        ci %= 26    # only 23 letters in the alphabet
-        #print(f"ci for {c}: {ci}")
-        cyphertext += chr(ci + add)
-
-    return cyphertext
-
-
-if len(sys.argv) <= 2 or len(sys.argv) >= 5:
-    print("Takes two arguments: <SOURCE> <KEY> [-e]")
-    exit(1)
-
-source: str = sys.argv[1]
-target: str = ""
-key = int(sys.argv[2])
-
-if len(sys.argv) >= 4 and sys.argv[3] == "-e":
-    print("encrypting...")
-    target = internal(source, -key)
-
-
-else:
-    print("decrypting...")
-    target = internal(source, key)
-
-print("=" * 80)
-print("%s" % target)