Fix all errors mentioned in pre-commit run (#2512)

* Fix all errors mentioned in pre-commit run:

- Fix end of file
- Remove trailing whitespace
- Fix files with black
- Fix imports with isort

* Fix errors

project_euler/problem_11/grid.txt

@@ -17,4 +17,4 @@
 04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
 20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
 20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
-01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48
+01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48

project_euler/problem_99/base_exp.txt

@@ -997,4 +997,4 @@
 672276,515708
 325361,545187
 172115,573985
-13846,725685
+13846,725685

project_euler/project_euler_answers.json

@@ -2899,4 +2899,4 @@
     725,
     "4598797036650685"
   ]
-]
+]