first commit: one-api base code + SAAS plan document

common/utils/array.go

@@ -0,0 +1,13 @@
+package utils
+
+func DeDuplication(slice []string) []string {
+	m := make(map[string]bool)
+	for _, v := range slice {
+		m[v] = true
+	}
+	result := make([]string, 0, len(m))
+	for v := range m {
+		result = append(result, v)
+	}
+	return result
+}