Coding style change for project_euler problem 36 and 35 (#3062)

* add problem url. Add typehint, default value and doctest

* run black

* add project url. add solution function for problem 35

* add space between imports on problem 35

* Update sol1.py

* Update sol1.py

Co-authored-by: Dhruv <dhruvmanila@gmail.com>

project_euler/problem_35/sol1.py

@@ -1,4 +1,9 @@
 """
+Project Euler Problem 35
+https://projecteuler.net/problem=35
+
+Problem Statement:
+
 The number 197 is called a circular prime because all rotations of the digits:
 197, 971, and 719, are themselves prime.
 There are thirteen such primes below 100: 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73,
@@ -65,5 +70,13 @@ def find_circular_primes(limit: int = 1000000) -> list[int]:
     return result
 
 
+def solution() -> int:
+    """
+    >>> solution()
+    55
+    """
+    return len(find_circular_primes())
+
+
 if __name__ == "__main__":
     print(f"{len(find_circular_primes()) = }")