Add missing newlines after docstrings in problem files for consistency

Author: ianlintner

src/interview_workbook/leetcode/graphs/number_of_islands.py

@@ -5,6 +5,7 @@
 LeetCode link: https://leetcode.com/problems/number-of-islands/
 Description: Count the number of islands in a 2D grid where ‘1’ represents land and ‘0’ represents water. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically.
 """
+
 from src.shared.problems import Category, Difficulty, register_problem
 
 

src/interview_workbook/leetcode/stack/largest_rectangle_in_histogram.py

@@ -4,6 +4,7 @@
 Given a histogram represented by an array of bar heights,
 find the area of the largest rectangle in it.
 """
+
 from interview_workbook.leetcode._registry import register_problem
 from interview_workbook.leetcode._types import Category, Difficulty
 
@@ -28,9 +29,6 @@ def demo():
     return str(Solution().solve([2, 1, 5, 6, 2, 3]))
 
 
-from interview_workbook.leetcode._registry import register_problem
-from interview_workbook.leetcode._types import Category, Difficulty
-
 register_problem(
     id=84,
     slug="largest_rectangle_in_histogram",

src/interview_workbook/leetcode/stack/min_stack.py

@@ -3,6 +3,7 @@
 
 TODO: Add problem description
 """
+
 from interview_workbook.leetcode._registry import register_problem
 from interview_workbook.leetcode._types import Category, Difficulty
 

src/interview_workbook/leetcode/two_pointers/two_sum_ii.py

@@ -8,6 +8,7 @@
 
 https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/
 """
+
 from src.interview_workbook.leetcode._runner import register_problem
 from src.interview_workbook.leetcode._types import Category, Difficulty
 
@@ -36,8 +37,6 @@ def demo():
     return str(result)
 
 
-from src.interview_workbook.leetcode._runner import register_problem
-from src.interview_workbook.leetcode._types import Category, Difficulty
 register_problem(
     id=167,
     slug="two-sum-ii-input-array-is-sorted",