TCS|INFOSYS|HCL|ACCENTURE|MNC.. Coding Question Using Java & Java8 Stream API For 2-3+Yrs Exp Day-2

I Covered two questions which is frequently asked in Multinational Company.
PROBLEM(I). PRINT OR DISPLAY THE NON-REPEATED CHARACTER
OR REMOVE THE DUPLICATE CHARACTER IN A STRING.
LIKE:-STRING =“BOOKKEEPER” THEN OUTPUT WILL BE [P , B , R].

PROBLEM(II).PRINT OR DISPLAY THE REPEATED OR DUPLICATE CHARCATER IN A STRING
LIKE:-STRING=“BOOKKEEPER” THEN OUTPUT WILL BE [E , K , O].

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