Adding util method to replace invalid input characters

- Also better type hints

utils/CipherUtils.py

@@ -1,10 +1,40 @@
-import AlphabetUtils as au
+from utils import AlphabetUtils as au
+
+GERMAN_FREQUENCY_PROFILE = [
+		0.0651,
+		0.0189,
+		0.0306,
+		0.0508,
+		0.1740,
+		0.0166,
+		0.0301,
+		0.0476,
+		0.0755,
+		0.0027,
+		0.0121,
+		0.0344,
+		0.0253,
+		0.0978,
+		0.0251,
+		0.0079,
+		0.0002,
+		0.0700,
+		0.0727,
+		0.0615,
+		0.0435,
+		0.0067,
+		0.0189,
+		0.0003,
+		0.0004,
+		0.0113
+	]
 
 
 def calculate_frequency(text: str, fancy_printing: bool = False):
 	"""
 	Calculates the frequency of every letter in the german alphabet for the given text
 	:param text: The text to calculate the letter frequency for
+	:param fancy_printing: Whether to print the frequencies to the console
 	:return: A list of frequencies, where index 0 contains the frequency of a in percent and so on.
 	"""
 	occurrence_count = [0 for i in range(26)]
@@ -26,6 +56,24 @@ def calculate_frequency(text: str, fancy_printing: bool = False):
 	return occurrence_frequency
 
 
+def transform_invalid_chars(input: str) -> str:
+	"""
+	Transforms invalid characters like german umlauts into their allowed alternatives
+	:param input: The text to check
+	:return: The improved text
+	"""
+	res = input
+	res = res.replace('ä', 'ae')
+	res = res.replace('A', 'Ae')
+	res = res.replace('ö', 'oe')
+	res = res.replace('Ö', 'Oe')
+	res = res.replace('ü', 'ue')
+	res = res.replace('Ü', 'Ue')
+	res = res.replace('ß', 'ss')
+
+	return res
+
+
 if __name__ == '__main__':
 	print(
 		calculate_frequency('Hier den Text eingeben, für den die Wahrscheinlichkeiten berechnet werden sollen', True))