This program demonstrates two key string manipulation tasks:

• Checking if a character already exists in a string.
• Removing duplicate characters from a string.

• Signature:

  public static bool isExists(String value, char find)
  • Description:
    This method checks whether the specified character (find) exists in the input string (value).It returns true if the character is found and false otherwise.

• Signature:

  public static String removeDuplicates(String value)
  • Description:
    This method removes all duplicate characters from the input string and retains only the first occurrence of each character. I nternally, the method uses the isExists method to determine whether a character has already been processed.
  • Example: Input: "programming" Output: "progamin"

• Signature:

  public static void main(String[] args)
  • Description:
    1. Prompts the user to input a string.
    2. Uses the removeDuplicates method to remove duplicate characters.
    3. Displays the original string and the result after duplicate removal.

• The program should handle all possible string inputs without restrictions.
• Use only for loops or while loops to implement the tasks.
• Avoid using any built-in string manipulation methods such as substring, toCharArray, or others.
• The only allowed method is length() to determine the length of the string

• Inside the removeDuplicates method, you can use the isExists method to check whether a character has already been processed.
• The isExists method should loop through the previously processed characters to determine if the current character already exists.