Fix ameba lint errors

[watzon]

Currently the build is failing because of ameba lint errors. These include:

• [x] src/cadmium/distance/jaro_winkler.cr:64:13
  • [x] [C] Metrics/CyclomaticComplexity: Cyclomatic complexity too high [24/10]
• [x] src/cadmium/sentiment.cr:42:5
  • [x] [C] Metrics/CyclomaticComplexity: Cyclomatic complexity too high [11/10]
• [x] src/cadmium/tokenizer/aggressive_tokenizer.cr:14:5
  • [x] [C] Metrics/CyclomaticComplexity: Cyclomatic complexity too high [11/10]

It looks like the main problem is the cyclomatic complexity of some of the algorithms. Where possible this should be reduced.