refactor: replace cloneXXX with generics function cloneSlice

client.go

@@ -1443,9 +1443,9 @@ func (c *Client) Clone() *Client {
 	cc.PathParams = cloneMap(c.PathParams)
 	cc.QueryParams = cloneUrlValues(c.QueryParams)
 	cc.FormData = cloneUrlValues(c.FormData)
-	cc.beforeRequest = cloneRequestMiddleware(c.beforeRequest)
-	cc.udBeforeRequest = cloneRequestMiddleware(c.udBeforeRequest)
-	cc.afterResponse = cloneResponseMiddleware(c.afterResponse)
+	cc.beforeRequest = cloneSlice(c.beforeRequest)
+	cc.udBeforeRequest = cloneSlice(c.udBeforeRequest)
+	cc.afterResponse = cloneSlice(c.afterResponse)
 	cc.dumpOptions = c.dumpOptions.Clone()
 	cc.retryOption = c.retryOption.Clone()
 	return &cc

req.go

@@ -93,25 +93,6 @@ func cloneSlice[T any](s []T) []T {
 	return ss
 }
 
-// TODO: change to generics function when generics are commonly used.
-func cloneRequestMiddleware(m []RequestMiddleware) []RequestMiddleware {
-	if len(m) == 0 {
-		return nil
-	}
-	mm := make([]RequestMiddleware, len(m))
-	copy(mm, m)
-	return mm
-}
-
-func cloneResponseMiddleware(m []ResponseMiddleware) []ResponseMiddleware {
-	if len(m) == 0 {
-		return nil
-	}
-	mm := make([]ResponseMiddleware, len(m))
-	copy(mm, m)
-	return mm
-}
-
 func cloneUrlValues(v url.Values) url.Values {
 	if v == nil {
 		return nil