Reorganized the code, moved more things to the new part

internal/server/indexHandler.go

@@ -0,0 +1,28 @@
+package server
+
+import (
+	"music-server/internal/backend"
+	"net/http"
+
+	"github.com/labstack/echo"
+)
+
+type IndexHandler struct {
+}
+
+func NewIndexHandler() *IndexHandler {
+	return &IndexHandler{}
+}
+
+func (i *IndexHandler) GetVersion(ctx echo.Context) error {
+	versionHistory := backend.GetVersionHistory()
+	if versionHistory.Version == "" {
+		return ctx.JSON(http.StatusNotFound, "version not found")
+	}
+	return ctx.JSON(http.StatusOK, versionHistory)
+}
+
+func (i *IndexHandler) GetDBTest(ctx echo.Context) error {
+	backend.TestDB()
+	return ctx.JSON(http.StatusOK, "TestedDB")
+}