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Code const interwine = str => [str] .reduce((r,_,i,s) => i%2 ? [r,s[(s.length+i-1)/2]] : [r,s[i/2]], []) .join('')Test Cases Test.assertEquals(interwine('13572468'), '12345678'); Test.assertEquals(interwine('acegbdfh'), 'abcdefgh');Output:
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