This method is same as addString() method but here a start, a separator and an end is also included.
Method Definition: def addString(sb: mutable.StringBuilder, start: String, sep: String, end: String): mutable.StringBuilder
Where, sep is the separator stated.
Return Type: It returns the elements of the SortedMap in the String Builder and a start, a separator and an end is also included here.
>>>cs -> 3|for -> 3|geeks -> 5--
>>>for -> 3|geeks -> 5--
So, here the identical keys are removed.
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