restructured the project to comply community guideline, for others check release note

internal/proxy/fields/scheme.go

@@ -0,0 +1,21 @@
+package fields
+
+import (
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+type Scheme string
+
+func NewScheme[String ~string](s String) (Scheme, E.NestedError) {
+	switch s {
+	case "http", "https", "tcp", "udp":
+		return Scheme(s), nil
+	}
+	return "", E.Invalid("scheme", s)
+}
+
+func (s Scheme) IsHTTP() bool   { return s == "http" }
+func (s Scheme) IsHTTPS() bool  { return s == "https" }
+func (s Scheme) IsTCP() bool    { return s == "tcp" }
+func (s Scheme) IsUDP() bool    { return s == "udp" }
+func (s Scheme) IsStream() bool { return s.IsTCP() || s.IsUDP() }