if the file being received already exists locally, it will be renamed

internal/transfer/writer.go

@@ -0,0 +1,16 @@
+package transfer
+
+import "io"
+
+type Writer struct {
+	w        io.Writer
+	filePath string
+}
+
+func (w Writer) Write(p []byte) (n int, err error) {
+	return w.w.Write(p)
+}
+
+func (w Writer) GetFilePath() string {
+	return w.filePath
+}