my code work properly in my my local device but its not working in kata what should i do now??

It's not exactly clear, but it lloks like the description uses exact decial values, so this test is incorrect:
test.assert_equals(e12_series(1.1), 1)

1.2 should equal 1

The literal 1.1 represents the fraction 2476979795053773 / 2251799813685248 (≈ 1.10000000000000009), which is greater than decimal 1.1 and should be expected to be rounded to 1.2.

Sample tests are not using describe and it blocks.

Test framework and solution should be imported explicitly.

Your function will returns normalized n.

And what does "normalized n" mean?