Use existing function for nil string setting

In the previous PR (#138) I added a `NilString` function and used it to
return `nil` if a string was empty, or a pointer to the string
otherwise, but this functionality is already available via the
`readStringPtrFromResource` function, so use that instead.

Author: andrew-bulford-form3

kong/resource_kong_consumer.go

@@ -43,8 +43,8 @@ func resourceKongConsumer() *schema.Resource {
 func resourceKongConsumerCreate(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
 
 	consumerRequest := &kong.Consumer{
-		Username: NilString(d.Get("username").(string)),
-		CustomID: NilString(d.Get("custom_id").(string)),
+		Username: readStringPtrFromResource(d, "username"),
+		CustomID: readStringPtrFromResource(d, "custom_id"),
 		Tags:     readStringArrayPtrFromResource(d, "tags"),
 	}
 

kong/utils.go

@@ -154,13 +154,3 @@ func IDToString(v *string) string {
 	}
 	return *v
 }
-
-// NilString converts a string to a string pointer,
-// or if empty returns nil.
-func NilString(str string) *string {
-	if str == "" {
-		return nil
-	} else {
-		return kong.String(str)
-	}
-}