at least you can end the stage

Common/Utils/ExcelReader/ExcelBase.cs

@@ -0,0 +1,33 @@
+using Newtonsoft.Json;
+
+namespace Common.Utils.ExcelReader
+{
+#pragma warning disable CS8618, CS8602 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+    public abstract class BaseExcelReader<Self, Scheme>
+    {
+        public Scheme[] All { get; set; }
+        private readonly Logger c = new("Factory", ConsoleColor.Yellow);
+        public abstract string FileName { get; }
+        private static Self Instance;
+
+        public static Self GetInstance()
+        {
+            Instance ??= Activator.CreateInstance<Self>();
+
+            if ((Instance as BaseExcelReader<Self, Scheme>).All == null)
+            {
+                (Instance as BaseExcelReader<Self, Scheme>).Load();
+                if((int)Global.config.VerboseLevel > 1)
+                    (Instance as BaseExcelReader<Self, Scheme>).c.Log($"{typeof(Self).Name} Excel Loaded From {(Instance as BaseExcelReader<Self, Scheme>).FileName}");
+            }
+
+            return Instance;
+        }
+
+        public void Load()
+        {
+            All = JsonConvert.DeserializeObject<Scheme[]>(File.ReadAllText($"Resources\\ExcelOutputAsset\\{FileName}")) ?? Array.Empty<Scheme>();
+        }
+#pragma warning restore CS8618, CS8602 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+    }
+}