refactor: clean code

internal/pkg/sdk3rd/bunny/api.go

@@ -0,0 +1,16 @@
+package bunnysdk
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+)
+
+func (c *Client) AddCustomCertificate(req *AddCustomCertificateRequest) ([]byte, error) {
+	if req.PullZoneId == "" {
+		return nil, fmt.Errorf("bunny api error: invalid parameter: PullZoneId")
+	}
+
+	resp, err := c.sendRequest(http.MethodPost, fmt.Sprintf("/pullzone/%s/addCertificate", url.PathEscape(req.PullZoneId)), req)
+	return resp.Body(), err
+}