fix issue #75

[yanlesin]

fix issue #75

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (42269f7) 100.00% compared to head (a705ec3) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #88 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 7 7 Lines 265 259 -6 ========================================= - Hits 265 259 -6 ``` | [Files](https://app.codecov.io/gh/yanlesin/SEC13Flist/pull/88?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yan+Lyesin) | Coverage Δ | | |---|---|---| | [R/utils.R](https://app.codecov.io/gh/yanlesin/SEC13Flist/pull/88?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yan+Lyesin#diff-Ui91dGlscy5S) | `100.00% <100.00%> (ø)` | | | [src/iscusip.cpp](https://app.codecov.io/gh/yanlesin/SEC13Flist/pull/88?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yan+Lyesin#diff-c3JjL2lzY3VzaXAuY3Bw) | `100.00% <100.00%> (ø)` | |

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