Fix clippy warnings

[moCello]

Resolves #774

[codecov]

Codecov Report

Merging #775 (b003ab7) into master (d3bcc6a) will increase coverage by 0.01%.
The diff coverage is 80.76%.

❗ Current head b003ab7 differs from pull request most recent head 1b63afc. Consider uploading reports for the commit 1b63afc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #775      +/-   ##
==========================================
+ Coverage   84.95%   84.96%   +0.01%     
==========================================
  Files          57       57              
  Lines        4040     4037       -3     
==========================================
- Hits         3432     3430       -2     
+ Misses        608      607       -1     

Files	Coverage Δ
src/commitment_scheme/kzg10/key.rs	84.28% <ø> (+0.39%)	⬆️
src/commitment_scheme/kzg10/srs.rs	81.94% <100.00%> (ø)
src/composer.rs	90.57% <100.00%> (+0.03%)	⬆️
src/composer/compiler.rs	99.44% <100.00%> (-0.01%)	⬇️
src/composer/prover.rs	95.33% <100.00%> (-0.03%)	⬇️
src/fft/polynomial.rs	46.82% <100.00%> (+0.36%)	⬆️
src/fft/evaluations.rs	25.00% <0.00%> (ø)
src/composer/compiler/compress.rs	86.04% <86.66%> (+0.55%)	⬆️
src/runtime.rs	16.66% <0.00%> (-2.09%)	⬇️

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d3bcc6a...1b63afc. Read the comment docs.

[HDauven]

LGTM