Fix using a c++23 extension with labels at the end of a block and fix writable strings warnings.

Also remove categorized days that had the deleted category.

src/work-calendar.cpp

@@ -69,10 +69,10 @@ void init(){
     year = get_current_year();
 }
 
-static char* savefile_path = "./calendar";
-static char* wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki"; 
+static const char *savefile_path = "./calendar";
+static const char *wiki_url = "https://gitea.ammerhai.com/Ammerhai/work-calendar/wiki";
 
-static const char* month_names[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
+static const char *month_names[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
 
 typedef struct Category {
     bool editing;
@@ -426,7 +426,7 @@ void per_frame(){
                             };
                             num_categorized_days++;
                         }
-                        color_changed:
+                        color_changed:;
                     }
 
                     ImGui::EndTable();
@@ -485,6 +485,18 @@ void per_frame(){
 
                 ImGui::TableSetColumnIndex(3);
                 if (ImGui::Button("d")) {
+                    for (size_t j = 0; j < num_categorized_days; j++) {
+                        // Remove categorized days that have the to be deleted category
+                        if (categorized_days[j].category == i) {
+                            for (size_t k = j; k < num_categorized_days - 1; k++) categorized_days[k] = categorized_days[k + 1];
+                            num_categorized_days--;
+                            j--;
+                        }
+                        // Decrement the category index of all categorized days that have an index higher than the one to be removed
+                        if (categorized_days[j].category > i) categorized_days[j].category--;
+                    }
+                    // Remove the category
+                    for (size_t j = i; j < num_categories - 1; j++) categories[j] = categories[j + 1];
                     num_categories--;
                 }