*.replace(); funktioniert auf dem Arduino Uno Wifi Rev. 2 nicht

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10 
char currentLine[] = "%2216%22,%20%2217%22";

char* removestr(char* str, const char* str2Remove) {
  if ((str == nullptr)) return str;

  size_t len = strlen(str);
  if (len == 0) return str;

  size_t len2Remove = strlen(str2Remove);
  if (len2Remove == 0) return str;

  char *readFrom = str;
  char *foundAt;
  while ((foundAt = strstr(readFrom, str2Remove)) != NULL) {
    memmove(foundAt, foundAt + len2Remove, (readFrom + len) - (foundAt + len2Remove) + 1); // move the '\0' at the same time
    readFrom = foundAt;
    len -= len2Remove;
  }
  return str;
}

void setup()
{
  Serial.begin(115200);
  Serial.println(currentLine);
  removestr(currentLine, "%22");
  Serial.println(currentLine);
  removestr(currentLine, "%20");
  Serial.println(currentLine);
  Serial.println("Das Ergebnis sollte 16,17 sein");
}

void loop() {}