Change occurrences of str.format to f-strings (#4118)

* f-string update rsa_cipher.py

* f-string update rsa_key_generator.py

* f-string update burrows_wheeler.py

* f-string update non_recursive_segment_tree.py

* f-string update red_black_tree.py

* f-string update deque_doubly.py

* f-string update climbing_stairs.py

* f-string update iterating_through_submasks.py

* f-string update knn_sklearn.py

* f-string update 3n_plus_1.py

* f-string update quadratic_equations_complex_numbers.py

* f-string update nth_fibonacci_using_matrix_exponentiation.py

* f-string update sherman_morrison.py

* f-string update levenshtein_distance.py

* fix lines that were too long

dynamic_programming/climbing_stairs.py

@@ -25,8 +25,9 @@ def climb_stairs(n: int) -> int:
         ...
     AssertionError: n needs to be positive integer, your input -7
     """
-    fmt = "n needs to be positive integer, your input {}"
-    assert isinstance(n, int) and n > 0, fmt.format(n)
+    assert (
+        isinstance(n, int) and n > 0
+    ), f"n needs to be positive integer, your input {n}"
     if n == 1:
         return 1
     dp = [0] * (n + 1)

dynamic_programming/iterating_through_submasks.py

@@ -37,8 +37,9 @@ def list_of_submasks(mask: int) -> list[int]:
 
     """
 
-    fmt = "mask needs to be positive integer, your input {}"
-    assert isinstance(mask, int) and mask > 0, fmt.format(mask)
+    assert (
+        isinstance(mask, int) and mask > 0
+    ), f"mask needs to be positive integer, your input {mask}"
 
     """
     first submask iterated will be mask itself then operation will be performed