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Merge pull request avinashkranjan#603 from smriti1313/caesar-cipher

Caesar cipher

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	`1`	`+## Caesar-cipher:`
	`2`	`+Caesar's cipher, the shift cipher, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.`
	`3`	`+`
	`4`	`+`
	`5`	`+### How to run this:`
	`6`	`+`
	`7`	`+- Simply copy-paste the code in your editor and run it using:`
	`8`	`+`
	`9`	+```python
	`10`	`+python3 caesar_cipher.py`
	`11`	+```
	`12`	`+`
	`13`	`+### Output:`
	`14`	`+`
	`15`	`+![](output.png)`

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	`1`	`+import string as st`
	`2`	`+`
	`3`	`+letter_list=st.ascii_lowercase`
	`4`	`+alphabet=[letter for letter in letter_list]*2`
	`5`	`+`
	`6`	`+def caesar(text1, shift1, direction1):`
	`7`	`+ end_text = ''`
	`8`	`+ if direction=='decode':`
	`9`	`+ shift1 *= -1`
	`10`	`+`
	`11`	`+ for char in text1:`
	`12`	`+ if char in alphabet:`
	`13`	`+ position = alphabet.index(char)`
	`14`	`+ new_position = position + shift1`
	`15`	`+ end_text += alphabet[new_position]`
	`16`	`+ else:`
	`17`	`+ end_text += char`
	`18`	`+ print(f'The {direction1}d text is: {end_text}.')`
	`19`	`+`
	`20`	`+`
	`21`	`+should_continue = True`
	`22`	`+while should_continue:`
	`23`	`+ direction = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")`
	`24`	`+ text = input("Type your message:\n").lower()`
	`25`	`+ shift = int(input("Type the shift number:\n"))`
	`26`	`+ shift = shift % 25`
	`27`	`+`
	`28`	`+ caesar(text, shift, direction)`
	`29`	`+ choice=input("Type 'yes' to continue otherwise type 'no'.\n")`
	`30`	`+ if choice == 'no':`
	`31`	`+ should_continue=False`

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