Refactor: Move commit_msg_generator.go to src/ directory and update build scripts

Author: joeeeeey

Makefile

@@ -4,14 +4,14 @@ TEST_DIFF_FILE ?= test/diff.txt
 
 test:
 	export TEST_DIFF_FILE=$(TEST_DIFF_FILE) && \
-	go run commit_msg_generator.go test/test-commit-msg.txt
+	go run src/commit_msg_generator.go test/test-commit-msg.txt
 
 OS := $(shell go env GOOS)
 ARCH := $(shell go env GOARCH)
 OUT_FILE := build/commit_msg_generator_$(OS)_$(ARCH)
 
 build:
-	go build -o $(OUT_FILE) commit_msg_generator.go
+	go build -o $(OUT_FILE) src/commit_msg_generator.go
 	chmod +x $(OUT_FILE)
 
 create_hook:
@@ -21,11 +21,11 @@ create_hook:
 
 cross_platform_build:
 	# Build for Linux AMD64
-	GOOS=linux GOARCH=amd64 go build -o build/commit_msg_generator_linux_amd64 commit_msg_generator.go
+	GOOS=linux GOARCH=amd64 go build -o build/commit_msg_generator_linux_amd64 src/commit_msg_generator.go
 
 	# Build for macOS ARM64 (Apple Silicon)
-	GOOS=darwin GOARCH=arm64 go build -o build/commit_msg_generator_darwin_arm64 commit_msg_generator.go
+	GOOS=darwin GOARCH=arm64 go build -o build/commit_msg_generator_darwin_arm64 src/commit_msg_generator.go
 	chmod +x build/commit_msg_generator_darwin_arm64
 	chmod +x build/commit_msg_generator_linux_amd64
 	# Build for Windows x86_64
-	GOOS=windows GOARCH=amd64 go build -o build/commit_msg_generator_win_amd64.exe commit_msg_generator.go
+	GOOS=windows GOARCH=amd64 go build -o build/commit_msg_generator_win_amd64.exe src/commit_msg_generator.go