Below is the single$-$tape turing machine that accepts a function Triple$($w$)=$ www where w is in $\{$a$,$b$\}*$

Example of input:

abbaabbaabba $($w $=$ abba$)$

aaa $($w $=$ a$)$

Convert this to the double$-$tape turing machine

End Condition of Function Computation: the head returns to the first symbol of the output string; the first tape contains only the output, the second tape is made blank.