I am going to design a Turing machine for doubling any words. My algorithm is such that for word $X$ as input, the output will be in the form $X@X$ which $@$ is a character. How can design an one-tape Turing machine that give exactly $XX$ as its output? For example, X=abba, XX=abbaabba. Thank you in advance for consideration.
2026-03-30 00:56:52.1774832212
One tape Turing machine for doubling words(strings)
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