char chars[]="hello world!";
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
Serial.print(F("Delete end of String"));
chars[6]=0;
Serial.println(chars);
Serial.println(F("Replace word"));
chars[6]='Y';
chars[7]='o';
chars[8]='u';
chars[9]='0';
Serial.println(chars);
Serial.print("String lenth: ");
Serial.println(strlen(chars));
Serial.print("Array length:");
Serial.println(sizeof(chars));
for(int i=0;i<sizeof(chars);i++){
Serial.println(chars[i]);
  Serial.println(chars[i]);
}
Serial.println(F("end of string"));
}
void loop() {}
  // put your main code her