feat: Modify a string by converting to char array and replacing a character

🔍 What this code does:
- Converts the string `"abc"` to a character array using `toCharArray()`.
- Replaces the character at index 2 (`'c'`) with `'d'`.
- Converts the modified character array back to a string.
- Prints the new string, which becomes `"abd"`.

✅ Why:
Strings in Java are immutable. To change individual characters, convert to a char array, modify, then reconstruct the string.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section6StringClassPrinting/src/StringC.java

@@ -1,6 +1,5 @@
 public class StringC {
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) {
         String s = "abc";
         char[] sArray = s.toCharArray();
         sArray[2] = 'd';
@@ -10,7 +9,9 @@ public static void main(String[] args)
 }
 
 /*
-The toCharArray() method in Java converts a String into a char array. For example, if you have a string "abc",
+The toCharArray() method in Java converts a String into a char array.
+
+For example, if you have a string "abc",
 calling toCharArray() will return a char array like this: {'a', 'b', 'c'}.
 
 s.toCharArray() converts the string "abc" into a char array {'a', 'b', 'c'}.
@@ -21,13 +22,14 @@ Finally, you convert the modified char array back into a String using new String
 
 Converting a String to a char array is useful when you need to manipulate individual characters in the string.
 
-Strings in Java are immutable, meaning once created, they cannot be changed. However, a char array is mutable,
-so you can modify its elements directly.
+Strings in Java are immutable, meaning once created, they cannot be changed.
+
+However, a char array is mutable, so you can modify its elements directly.
 
 You wanted to change the third character ('c') to 'd'.
 
 Since String is immutable, you first converted it to a char array using toCharArray().
 
 Then, you modified the array (sArray[2] = 'd').
 Finally, you converted the modified char array back to a String.
-*/
+*/