feat: truncate to length + tests

[atymic]

No description provided.

[codecov]

Codecov Report

Merging #9 (4789f36) into main (1837911) will decrease coverage by 2.35%.
The diff coverage is 92.85%.

@@             Coverage Diff              @@
##               main       #9      +/-   ##
============================================
- Coverage     97.95%   95.60%   -2.36%     
- Complexity       18       36      +18     
============================================
  Files             1        1              
  Lines            49       91      +42     
============================================
+ Hits             48       87      +39     
- Misses            1        4       +3     

Impacted Files	Coverage Δ
src/SmsLength.php	95.60% <92.85%> (-2.36%)	⬇️

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