fix: utf8_prefix should take into account empty lines #178

Job	Run time
Static analysis - forge	27s
Dialyzer - forge	38s
Dialyzer - expert_credo	2m 37s
Static analysis - engine	32s
Dialyzer - engine	2m 33s
Static analysis - expert_credo	38s
Release test (macos-14)	2m 40s
prep-matrix	5s
Static analysis - expert	26s
Release test (ubuntu-latest)	1m 37s
Dialyzer - expert	2m 28s
Release test (macos-13)	5m 29s
Test engine on OTP 27 / Elixir 1.18	1m 37s
Test engine on OTP 26 / Elixir 1.17	1m 35s
Test engine on OTP 27 / Elixir 1.17	1m 34s
Test expert_credo on OTP 28 / Elixir 1.18.4	40s
Test expert_credo on OTP 26 / Elixir 1.18	40s
Test expert_credo on OTP 27 / Elixir 1.17	45s
Test engine on OTP 26 / Elixir 1.18	1m 38s
Test expert_credo on OTP 27 / Elixir 1.18	22s
Test expert_credo on OTP 26 / Elixir 1.17	42s
Test engine on OTP 28 / Elixir 1.18.4	1m 32s
Test engine on OTP 26 / Elixir 1.16	1m 30s
Test forge on OTP 27 / Elixir 1.18	50s
Test forge on OTP 26 / Elixir 1.18	46s
Test forge on OTP 26 / Elixir 1.17	46s
Test forge on OTP 27 / Elixir 1.17	49s
Test expert_credo on OTP 26 / Elixir 1.16	40s
Test forge on OTP 28 / Elixir 1.18.4	46s
Test forge on OTP 26 / Elixir 1.16	48s
Test expert on OTP 27.3.4.1 / Elixir 1.17.3	2m 35s
	40m 45s

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