Interface bug

[kaipartmann]

See #119.

[codecov]

Codecov Report

Attention: Patch coverage is 97.27626% with 7 lines in your changes missing coverage. Please review.

Project coverage is 89.24%. Comparing base (91849e4) to head (5cd3e6c).

Files	Patch %	Lines
src/core/storages.jl	78.94%	4 Missing ⚠️
src/physics/continuum_kinematics_inspired.jl	98.13%	2 Missing ⚠️
src/discretization/interaction_system.jl	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
+ Coverage   89.17%   89.24%   +0.06%     
==========================================
  Files          44       44              
  Lines        3677     3831     +154     
==========================================
+ Hits         3279     3419     +140     
- Misses        398      412      +14     

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[kaipartmann]

The interfaces may also be considered for the calculation of the energy based surface correction.