Write a function escape(s,t) that converts characters like newline and tab into visible escape sequences like \n and \t as it copies the string t to s. Use a switch. Write a function for the other direction as well, converting escape sequences into the real characters.
Handle newline, tab and backslash (\n, \t and \\), and copy every other character unchanged, including a backslash that doesn't start one of these sequences. Read the whole input, at most 3000 characters, into t. Print escape(s,t) followed by a newline, then t converted the other way.
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