day[07]: some improvements to formatting; formatted common library

.clang-format

···
 BasedOnStyle: Google
 AlignConsecutiveDeclarations: true
+AlignConsecutiveAssignments: true
+AlignConsecutiveMacros: true
 BinPackParameters: false
 ColumnLimit: 80
 IndentWidth: 4

src/07/solution.cxx

···
 
     for (size_t i = 1; i < data.size(); ++i) {
         auto& previous = data[i - 1];
-        auto& current = data[i];
+        auto& current  = data[i];
 
         for (size_t ch = 0; ch < current.size(); ++ch) {
             char previous_ch = previous[ch];
-            char current_ch = current[ch];
+            char current_ch  = current[ch];
             if (previous_ch != 'S' && previous_ch != '|') {
                 continue;
             }
···
 
     for (size_t i = 1; i < data.size(); ++i) {
         auto& previous = data[i - 1];
-        auto& current = data[i];
+        auto& current  = data[i];
 
         for (size_t ch = 0; ch < current.size(); ++ch) {
             if (previous[ch] == '|' && current[ch] == '^') {
···
         result = count_possible_paths(data, new_pos, cache);
 
     } else if (data[position.y][position.x] == '^') {
-        Position left = Position{.x = position.x - 1, .y = position.y};
+        Position left  = Position{.x = position.x - 1, .y = position.y};
         Position right = Position{.x = position.x + 1, .y = position.y};
 
         // a weird workaround to satisfy some static checks. maps must

src/common/getinputpath.cxx

···
+#include <filesystem>
+
 #include "common/istest.h"
-#include <filesystem>
 
 const std::filesystem::path get_input_path(std::filesystem::path data_root) {
-  std::filesystem::path data_path =
-      data_root / (is_test() ? "test.txt" : "input.txt");
+    std::filesystem::path data_path =
+        data_root / (is_test() ? "test.txt" : "input.txt");
 
-  return data_path;
+    return data_path;
 }

src/common/istest.cxx

···
 #include <string_view>
 
 bool is_test() {
-  std::string_view mode = "real";
-  if (const char *env_mode = std::getenv("AOC_MODE")) {
-    mode = env_mode;
-  }
+    std::string_view mode = "real";
+    if (const char* env_mode = std::getenv("AOC_MODE")) {
+        mode = env_mode;
+    }
 
-  return mode == "test";
+    return mode == "test";
 }