contribution guidelines checks (#1787)

* spelling corrections

* review

* improved documentation, removed redundant variables, added testing

* added type hint

* camel case to snake case

* spelling fix

* review

* python --> Python # it is a brand name, not a snake

* explicit cast to int

* spaces in int list

* "!= None" to "is not None"

* Update comb_sort.py

* various spelling corrections in documentation & several variables naming conventions fix

* + char in file name

* import dependency - bug fix

Co-authored-by: John Law <johnlaw.po@gmail.com>

other/autocomplete_using_trie.py

@@ -26,10 +26,10 @@ class Trie:
         result = []
         for c, v in d.items():
             if c == END:
-                subresult = [" "]
+                sub_result = [" "]
             else:
-                subresult = [c + s for s in self._elements(v)]
-            result.extend(subresult)
+                sub_result = [c + s for s in self._elements(v)]
+            result.extend(sub_result)
         return tuple(result)