in this step, the codes are:
text = 'Hello World'
shift = 3
alphabet = 'abcdefghijklmnopqrstuvwxyz'
encrypted_text = ''
for char in text.lower():
index = alphabet.find(char)
new_index = index + shift
encrypted_text = alphabet[new_index]
print('char:', char, 'new char:', encrypted_text)
The name before encrypted_text was new_char, why is it necessary to changethe variable name into encrypted_text?