modify solution and tests (#335)

Co-authored-by: Marat <marat@yabblezone.net>

Author: MaratSafiullinYabble

modules/50-loops/29-edge-cases/index.py

@@ -3,8 +3,6 @@ def is_arguments_for_substr_correct(string, index, length):
         return False
     elif length < 0:
         return False
-    elif index > len(string) - 1:
-        return False
     elif index + length > len(string):
         return False
     return True

modules/50-loops/29-edge-cases/test_code.py

@@ -3,12 +3,13 @@
 
 def test1():
     string = "Sansa Stark"
-    end = len(string) - 1
+    end = len(string)
     assert not index.is_arguments_for_substr_correct(string, -1, 0)
     assert not index.is_arguments_for_substr_correct(string, 0, -1)
     assert not index.is_arguments_for_substr_correct(string, end + 1, 0)
-    assert not index.is_arguments_for_substr_correct(string, end, 5)
-    assert index.is_arguments_for_substr_correct(string, end, 1)
+    assert not index.is_arguments_for_substr_correct(string, end, 1)
+    assert index.is_arguments_for_substr_correct(string, end, 0)
+    assert index.is_arguments_for_substr_correct(string, end - 1, 1)
     assert index.is_arguments_for_substr_correct(string, 3, 3)
     assert index.is_arguments_for_substr_correct(string, 0, 3)
     assert index.is_arguments_for_substr_correct(string, 0, 1)