Optimize country lookup by using a dictionary

[nikola-golijanin]

Optimize country lookup by by using a dictionary for faster access and improve null handling in country retrieval methods

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Clifftech123]

@nikola-golijanin Thank you for this. It will be reviewed. Thank you for contributing

[Clifftech123]

@nikola-golijanin Thank you for the contribution your request will be reviewed and merged.