support multi-module (#4)

* add multimodule
* re-package modules

server/internal/router/handler/init.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"net/http"
+
+	"galaxy/model/rest"
+
+	"github.com/gin-gonic/gin"
+)
+
+func InitHandler(c *gin.Context, executor CommandExecutor) {
+	var init rest.Init
+	if errorResponse(c, c.ShouldBindJSON(&init)) {
+		return
+	}
+
+	races := make([]string, len(init.Races))
+	for i := range init.Races {
+		races[i] = init.Races[i].Name
+	}
+
+	s, err := executor.GenerateGame(races)
+	if errorResponse(c, err) {
+		return
+	}
+
+	c.JSON(http.StatusCreated, s)
+}