void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println(remove_repeated("Vodacom VodaCom Tanzania"));
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}


String remove_repeated(String mm) {
  const char delimiter_here = ' ';
  if ( ! hasChar(mm, delimiter_here) ) {
    return mm;
  }

  String aa[10];
  splitting(mm, aa, delimiter_here);

  String vv = "";
  for ( byte x = 0; x < 8; x++ ) {
    String jj = aa[x];
    String nn = jj;
    jj.toLowerCase();
    if ( jj.length() < 2 ) {
      continue;
    }
     
    if ( vv.indexOf(jj) >= 0 ) {
      continue;
    }
    vv += jj + delimiter_here;
  }



  vv.trim();
  if ( vv.length() < 2 ) {
    vv = mm;
  }
  return vv;
}

void splitting(String splitMsg, String bb[], char delimiter) {
  int counter = 0 ;
  for ( int i = 0 ; i < splitMsg.length() ; i ++ ) {
    if ( splitMsg.charAt(i) == delimiter ) {
      counter++;
    }
    else {
      bb[counter] +=  splitMsg.charAt(i) ;
    }
  }
}


bool hasChar(String mm, const char tt) {
  int dd = mm.length();
  if ( dd < 2 ) {
    return false;
  }
  for ( int x = 0; x < dd; x++ ) {
    char cc = mm.charAt(x);
    if ( cc == tt ) {
      return true;
    }
  } // end for loop
  return false;
}