add config refactor structure

Makefile

@@ -1,27 +1,30 @@
 CXX = c++
-CXXFLAGS = -Wall -Wextra -O3
+CXXFLAGS = -Wall -Wextra -O3 -Isrc
 LDFLAGS = -static
-
 SRC_DIR = src
 OBJ_DIR = build
 BIN_DIR = bin
-
 SRC_EXT = cpp
 OBJ_EXT = o
 
-SOURCES = $(wildcard $(SRC_DIR)/*.$(SRC_EXT))
+# Find all source files recursively in subdirectories
+SOURCES = $(shell find $(SRC_DIR) -name '*.$(SRC_EXT)')
+# Create corresponding object files maintaining directory structure
 OBJECTS = $(SOURCES:$(SRC_DIR)/%.$(SRC_EXT)=$(OBJ_DIR)/%.$(OBJ_EXT))
-
 EXEC = $(BIN_DIR)/fissh
 
+# Get all unique subdirectories for build structure
+OBJ_DIRS = $(sort $(dir $(OBJECTS)))
+
 all: $(EXEC)
 
 $(EXEC): $(OBJECTS)
-	@mkdir -p $(BIN_DIR)   # Make sure the bin dir exists
+	@mkdir -p $(BIN_DIR)
 	$(CXX) $(OBJECTS) -o $(EXEC) $(LDFLAGS)
 
-$(OBJ_DIR)/%.o: $(SRC_DIR)/%.$(SRC_EXT)
-	@mkdir -p $(OBJ_DIR)   # Make sure the obj dir exists
+# Create object files, maintaining directory structure
+$(OBJ_DIR)/%.$(OBJ_EXT): $(SRC_DIR)/%.$(SRC_EXT)
+	@mkdir -p $(dir $@)
 	$(CXX) $(CXXFLAGS) -c $< -o $@
 
 clean:
@@ -30,4 +33,4 @@ clean:
 install: $(EXEC)
 	install -m 755 $(EXEC) /usr/local/bin/
 
-.PHONY: all clean run
+.PHONY: all clean install