Rename Project Euler directories and other dependent changes (#3300)

* Rename all Project Euler directories:

Reason:
The change was done to maintain consistency throughout the directory
and to keep all directories in sorted order.

Due to the above change, some config files had to be modified:
'problem_22` -> `problem_022`

* Update scripts to pad zeroes in PE directories

project_euler/problem_033/sol1.py

@@ -0,0 +1,68 @@
+"""
+Problem 33: https://projecteuler.net/problem=33
+
+The fraction 49/98 is a curious fraction, as an inexperienced
+mathematician in attempting to simplify it may incorrectly believe
+that 49/98 = 4/8, which is correct, is obtained by cancelling the 9s.
+
+We shall consider fractions like, 30/50 = 3/5, to be trivial examples.
+
+There are exactly four non-trivial examples of this type of fraction,
+less than one in value, and containing two digits in the numerator
+and denominator.
+
+If the product of these four fractions is given in its lowest common
+terms, find the value of the denominator.
+"""
+from fractions import Fraction
+from typing import List
+
+
+def is_digit_cancelling(num: int, den: int) -> bool:
+    if num != den:
+        if num % 10 == den // 10:
+            if (num // 10) / (den % 10) == num / den:
+                return True
+    return False
+
+
+def fraction_list(digit_len: int) -> List[str]:
+    """
+    >>> fraction_list(2)
+    ['16/64', '19/95', '26/65', '49/98']
+    >>> fraction_list(3)
+    ['16/64', '19/95', '26/65', '49/98']
+    >>> fraction_list(4)
+    ['16/64', '19/95', '26/65', '49/98']
+    >>> fraction_list(0)
+    []
+    >>> fraction_list(5)
+    ['16/64', '19/95', '26/65', '49/98']
+    """
+    solutions = []
+    den = 11
+    last_digit = int("1" + "0" * digit_len)
+    for num in range(den, last_digit):
+        while den <= 99:
+            if (num != den) and (num % 10 == den // 10) and (den % 10 != 0):
+                if is_digit_cancelling(num, den):
+                    solutions.append(f"{num}/{den}")
+            den += 1
+        num += 1
+        den = 10
+    return solutions
+
+
+def solution(n: int = 2) -> int:
+    """
+    Return the solution to the problem
+    """
+    result = 1.0
+    for fraction in fraction_list(n):
+        frac = Fraction(fraction)
+        result *= frac.denominator / frac.numerator
+    return int(result)
+
+
+if __name__ == "__main__":
+    print(solution())