String st1 = "Al-Huson"; 
String st2 = "College";

char buffer[10];

String X = "13,45";
String Y = "12345";

void setup() {
  // put your setup code here, to run once:
 
  Serial.begin(9600);
  
 // Characte(st1, st2);

  //Compares(st1, st2);  

  //Concat(st1, st2);  

  //EndsWith(st1, st2);  

  //Equals(st1, st2);  

  //EqualsIgnoreCase(st1, st2);

  //getBytes(st1, st2);

  //IndexOf(st1, st2);

  //LastIndexOf(st1, st2);
  
 // Length(st1, st2);
  
  //Remove(st1, st2);
  
 // Remove2(st1, st2);
  
  //Replace(st1, st2);
  
  //Reserve(st1, st2);
  
  //SetCharAt(st1, st2);
  
  //startsWith(st1, st2);
  
  //substring(st1, st2);
  
  //substring2(st1, st2);
  
  //toCharArray(st1, st2);
  
  //toFloat(X, Y);
  
  //toInt(X, Y);
  
  //toLowerCase(st1, st2);
  
 // toUpperCase(st1, st2);
  
  trim(st1, st2);

  
  
}

void loop() {
  // put your main code here, to run repeatedly:

}

//Returns the nth character of the String
void Characte(String st1, String st2){

  Serial.println(st1.charAt(1));
  Serial.println(st2.charAt(1));
}

//Compares the String to the given String S2
void Compares(String st1, String st2){

  Serial.println(st1.compareTo(st2));
  Serial.println(st2.compareTo(st1));
  Serial.println(st1.compareTo(st1));
}

//Returns a new String that is the combination of the String and S2
void Concat(String st1, String st2){
  st1.concat(st2);
  Serial.println(st1);
}

//Returns true if the String ends with the characters of S2
void EndsWith(String st1, String st2){

  Serial.println(st1.endsWith("son"));
  Serial.println(st1.endsWith("c"));
}

//Returns true if the String is an exact match for S2 (case-sensitive)
void Equals(String st1, String st2){

  Serial.println(st1.equals(st2));
}

//Same as equals but is not case-sensitive
void EqualsIgnoreCase(String st1, String st2){

  Serial.println(st1.equalsIgnoreCase(st2));
}


//Copies len(gth) characters into the supplied byte buffer
void getBytes(String st1, String st2){

  st1.getBytes(buffer,7);
  Serial.println(st1);

  st2.getBytes(buffer,7);
  Serial.println(st2);

}

//Returns the index of the supplied String (or character) or –1 if not found
void IndexOf(String st1, String st2){

  Serial.println(st1.indexOf('l'));
  Serial.println(st2.indexOf('g'));
}

//Same as indexOf but starts from the end of the String
void LastIndexOf(String st1, String st2){

  Serial.println(st1.lastIndexOf('l'));
  Serial.println(st2.lastIndexOf('g'));
}


//Returns the number of characters in the String
void Length(String st1, String st2){

  Serial.println(st1.length());
  Serial.println(st2.length());
}

//Removes the character in the String at the given index
void Remove(String st1, String st2){

  st1.remove(3);
  Serial.println(st1);
  st2.remove(3);
  Serial.println(st2);

}


//Removes the specified number of characters from the String starting at the given index
void Remove2(String st1, String st2){

  
  st1.remove(2,5);
  Serial.println(st1);
  st2.remove(2,2);
  Serial.println(st2);
}


//Replaces all instances of String (or character) A with B
void Replace(String st1, String st2){

  st1.replace('s','o');
  Serial.println(st1);
  st2.replace('e','l');
  Serial.println(st2);
}


//Sets aside (allocates) the specified number of bytes to make subsequent Stringoperations more efficient
void Reserve(String st1, String st2){

  Serial.println(st1.reserve(50));
  Serial.println(st2.reserve(50));
}



//Stores the character c in the String at the given index
void SetCharAt(String st1, String st2){

  st1.setCharAt(3,'x');
  Serial.println(st1);
  st2.setCharAt(3,'x');
  Serial.println(st2);
}


//Returns true if the String starts with the characters of S2
void startsWith(String st1, String st2){

  Serial.println(st1.startsWith("A"));
  Serial.println(st2.startsWith("c"));
}


//Returns a String with the characters starting from index to the end of the String
void substring(String st1, String st2){

  Serial.println(st1.substring(5));
  Serial.println(st2.substring(5));
}


//Same as above, but the substring ends at the character location before the to position
void substring2(String st1, String st2){

  Serial.println(st1.substring(2,6));
  Serial.println(st2.substring(2,6));
}


//Copies up to len characters of the String to the supplied buffer
void toCharArray(String st1, String st2){

  st1.toCharArray(buffer,7);
  Serial.println(st1); 
  st2.toCharArray(buffer,7);
  Serial.println(st2);

}


//Returns the floating-point value of the numeric digits in the String
void toFloat(String X, String Y){

  Serial.println(X.toFloat());
  Serial.println(Y.toFloat());
}


//Returns the integer value of the numeric digits in the String
void toInt(String X, String Y){

  Serial.println(X.toInt());
  Serial.println(Y.toInt());
}


//Returns a String with all characters converted to lowercase
void toLowerCase(String st1, String st2){

  st1.toLowerCase();
  Serial.println(st1);
  st2.toLowerCase();
  Serial.println(st2);
}


//Returns a String with all characters converted to Uppercase
void toUpperCase(String st1, String st2){

  st1.toUpperCase();
  Serial.println(st1);
  st2.toUpperCase();
  Serial.println(st2);
}


//Returns a String with all leading and trailing whitespace removed
void trim(String st1, String st2){

  st1.trim();
  Serial.println(st1);
  st2.trim();
  Serial.println(st2);
}