I just realized that my solution gives a different result than other solutions (I only checked Marcia's and Walter's) so I apologize, I thought that Yossi meant to remove just duplicated continuous characters, not all duplicate characters.
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges
