refactor: refactor codebase for improved performance and maintainability

- Simplify variable initialization in `decode` method
- Correct method call in `WriteString` function

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

sse-decoder.go

@@ -43,7 +43,7 @@ func (d *decoder) decode(r io.Reader) ([]Event, error) {
 	}
 
 	var currentEvent Event
-	var dataBuffer *bytes.Buffer = new(bytes.Buffer)
+	dataBuffer := new(bytes.Buffer)
 	// TODO (and unit tests)
 	// Lines must be separated by either a U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pair,
 	// a single U+000A LINE FEED (LF) character,

writer.go

@@ -12,7 +12,7 @@ type stringWrapper struct {
 }
 
 func (w stringWrapper) WriteString(str string) (int, error) {
-	return w.Writer.Write([]byte(str))
+	return w.Write([]byte(str))
 }
 
 func checkWriter(writer io.Writer) stringWriter {