Add docstring frequency finder

strings/camel_case_to_snake_case.py

@@ -5,8 +5,8 @@ def camel_to_snake_case(input_str: str) -> str:
     >>> camel_to_snake_case("someRandomString")
     'some_random_string'
 
-    >>> camel_to_snake_case("SomeRandomStr#ng")
-    'some_random_str_ng'
+    >>> camel_to_snake_case("SomeRandomString")
+    'some_random_string'
 
     >>> camel_to_snake_case("123someRandom123String123")
     '123_some_random_123_string_123'

strings/frequency_finder.py

@@ -36,6 +36,9 @@
 
 
 def get_letter_count(message: str) -> dict[str, int]:
+    """get_letter_count() is a function that takes message as parameter which is
+    supposed to be the string. and it returns a dictionary where string is a key
+    and integer is a value."""
     letter_count = dict.fromkeys(string.ascii_uppercase, 0)
     for letter in message.upper():
         if letter in LETTERS:
@@ -45,6 +48,7 @@ def get_letter_count(message: str) -> dict[str, int]:
 
 
 def get_item_at_index_zero(x: tuple) -> str:
+    """It takes x as parameter which is tuple and returns a string."""
     return x[0]