优化抽象工厂模式示例，添加品牌方法并重构工厂实现，更新构建脚本以支持更清晰的输出

go/Makefile

@@ -1,9 +1,16 @@
 BUILDDIR := build
 DIRS := $(shell ls -d */)
 
+ifndef VERBOSE
+.SILENT:
+endif
+
+all: build test clean
+
 .PHONY: build
 build:
-	mkdir -p $(BUILDDIR); \
+	echo "Building Go examples..."
+	mkdir -p $(BUILDDIR)
 	for dir in $(DIRS); do \
 	    if [ ! -f "$$dir/main.go" ]; then \
 	        continue; \
@@ -17,12 +24,11 @@ test:
 	for bin in $(BUILDDIR)/*; do \
 	    echo "\n"; \
 		$$bin; \
-	done; \
-	echo "\nAll Go examples executed.\n"
+		echo "\n"; \
+	done
+	echo "All Go examples executed."
 
 .PHONY: clean
 clean:
+	echo "Cleaning build directory..."
 	rm -rf $(BUILDDIR)/*
-
-.PHONY: all
-all: build test clean