Java program to Print all the Duplicates in the Input String.

Print all the duplicate values available in a input sting. For example :
1) input String = "Hello World"
Output = Letter 'l' appears 3 times
letter 'o' appears 2 times
Description = Here in "hello world" there is two letters are repeating themselves i.e 'l' and 'o' remaining letters are single.
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