This method is identical to the addString() method but here a separator is also included.
Method Definition: def addString(b: StringBuilder, sep: String): StringBuilder
Where, sep is the separator stated.
Return Type: It returns the elements of the SortedMap in the String Builder and a separator is also added between the elements of the SortedMap.
cs -> 2_for -> 3_geeks -> 5
for -> 3_geeks -> 2
So, here the identical keys are removed.
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