fix "modifer" -> "modifier" typo everywhere

proxychain/requestmodifiers/modify_query_params.go

@@ -0,0 +1,26 @@
+package requestmodifiers
+
+import (
+	"net/url"
+
+	"ladder/proxychain"
+)
+
+// ModifyQueryParams replaces query parameter values in URL's query params in a ProxyChain's URL.
+// If the query param key doesn't exist, it is created.
+func ModifyQueryParams(key string, value string) proxychain.RequestModification {
+	return func(chain *proxychain.ProxyChain) error {
+		q := chain.Request.URL.Query()
+		chain.Request.URL.RawQuery = modifyQueryParams(key, value, q)
+		return nil
+	}
+}
+
+func modifyQueryParams(key string, value string, q url.Values) string {
+	if value == "" {
+		q.Del(key)
+		return q.Encode()
+	}
+	q.Set(key, value)
+	return q.Encode()
+}