Answer Posted / swati

In stringBuilder we can modify original value
example: suppose a string "Swti" in that string we add a
after charator w then we can easily add the char a after w
then new string is "Swati"

But in string we can't modify original value we add add
another value in original value use concate function.
example: suppose a string is "Swati" in that string we
concate another string means "Pandey" by using concate
function

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