Replace malloc/strcpy with strdup

[manderiasian]

No description provided.

[codecov-io]

Codecov Report

Merging #44 into master will decrease coverage by 0.6%.
The diff coverage is 49.27%.

@@            Coverage Diff            @@
##           master     #44      +/-   ##
=========================================
- Coverage    90.7%   90.1%   -0.61%     
=========================================
  Files           3       3              
  Lines        1882    1879       -3     
  Branches      198     201       +3     
=========================================
- Hits         1707    1693      -14     
- Misses         54      62       +8     
- Partials      121     124       +3

Impacted Files	Coverage Δ
tests/simple.c	93.39% <100%> (-0.04%)	⬇️
src/wdmp_internal.c	84.97% <43.54%> (-2.5%)	⬇️

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