Builds binary ree from flat table. (char elements) Reads data from file with content of / string format. Example of file: a/b b/c a/d d/e c/g g/r g/h d/f f/n n/k

Result: ......................................................

                                a                                                                      
              b                                  d                                  
     c                --                e                f                
g      --          --      --      --      --        n      --      

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