Remove all uses of unexported functions from other packages

[dramanica]

Avoid using unexported functions

Fix #37

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8a8d602) 91.68% compared to head (523431b) 91.54%.

Files	Patch %	Lines
R/misc.R	72.72%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #38 +/- ## ========================================== - Coverage 91.68% 91.54% -0.14% ========================================== Files 55 56 +1 Lines 1503 1514 +11 ========================================== + Hits 1378 1386 +8 - Misses 125 128 +3 ```

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