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I was read all comments on this question, but all codes was share so verbosing. After that, i create a code with simple functions and less of line. in this case, i think this code work fine

void loop() {
    char data[255];
    uint8_t k = 0;
    while (Serial.available()) {
        data[k] = Serial.read();
         k++;
    }
    for (int i = 0; i < k; i++) {
        Serial.print(data[i]);
        data [i] = '\0';
    }
}