Learn String Manipulation by Building a Cipher - Step 35

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i have been trying to solve this code and i do believe it’s supposed to be working but it is not and i am not sure what is the issue with my code. please help!

Your code so far

text = 'Hello World'
shift = 3
alphabet = 'abcdefghijklmnopqrstuvwxyz'
encrypted_text = ''

# User Editable Region

for char in text.lower():
    if  char==' ':
        encrypted_text += ' '
    index = alphabet.find(char)
    new_index = index + shift
    encrypted_text = alphabet[new_index]
    print('char:', char, 'encrypted text:', encrypted_text)

# User Editable Region

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 35

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Instead of assigning alphabet[new_index] to encrypted_text, assign the current value of encrypted_text plus alphabet[new_index] to this variable.

You are just assigning alphabet[new_index] so far:

It doesn’t want to to just assign alphabet[new_index] but to add the current value of encrypted_text and alphabet[new_index] together, and assign that to encrypted_text