fix: remove trailing slash when joining empty path segments and disab…

[jkaninda]

…le path validation when group prefix is defined

[codecov]

Codecov Report

❌ Patch coverage is 35.71429% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
route.go	0.00%	5 Missing and 2 partials ⚠️
util.go	71.42%	1 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
util.go	51.96% <71.42%> (+0.41%)	⬆️
route.go	66.19% <0.00%> (-1.92%)	⬇️

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