Given a String, letter, and another String, word, return a String whose characters are the same as word except that the character at index 5 has been changed to letter.

changeIndexFiveCharacter(\"H\", \"obtest\") ? \"obtesH\" changeIndexFiveCharacter(\"A\", \"wonders\") ? \"wondeAs\" changeIndexFiveCharacter(\"C\", \"mannerism\") ? \"manneCism\"

Sol39:

Here\'s a possible implementation of the function in Java:

public static String changeIndexFiveCharacter(String letter, String word) {

// Check if the word has at least 6 characters

if (word.length()

return word;

}

// Replace the character at index 5 with the given letter

char[] chars = word.toCharArray();

chars[5] = letter.charAt(0);

return new String(chars);

}

The function takes two String parameters, letter and word, and returns a new String that is like word but with the character at index 5 replaced by the character in letter. If word has less than 6 characters, the function returns word unchanged.

The implementation first checks if the length of word is at least 6. If it is not, the function returns word without any modifications. Otherwise, it converts the word String to a character array using the toCharArray() method. It then replaces the character at index 5 of the array with the first character of letter using the assignment operator =. Finally, it creates a new String from the modified character array using the String(char[]) constructor and returns it.