Refactor go writer with the struct and struct method

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.01% (target: -5.00%)	:white_check_mark: 96.63%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (055b2ddef86b7e32f5d6aeec0767d606fd07cc19) | 2895 | 2813 | 97.17% | | | Head commit (f68399b13441b4cd2c5c06b5f72d351624ca93df) | 2904 (+9) | 2822 (+9) | 97.18% (**+0.01%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#146) | 89 | 86 | **96.63%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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Codecov Report

Attention: Patch coverage is 96.59091% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.92%. Comparing base (055b2dd) to head (f68399b).

Files with missing lines	Patch %	Lines
pyfastexcel/core/writer.go	96.42%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #146 +/- ## ======================================= Coverage 96.91% 96.92% ======================================= Files 26 26 Lines 2884 2892 +8 ======================================= + Hits 2795 2803 +8 Misses 65 65 Partials 24 24 ```

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