merge all branch and change project structure

internal/utils/id_test.go

@@ -0,0 +1,15 @@
+package utils
+
+import "testing"
+
+func TestGenID(t *testing.T) {
+	m := map[string]struct{}{}
+	for i := 0; i < 2000; i++ {
+		got := GenID()
+		if _, ok := m[got]; !ok {
+			m[got] = struct{}{}
+		} else {
+			t.Error("id generate error", got)
+		}
+	}
+}