fix: code refactoring and golangci-lint warns fixes #22

Job	Run time
tests / unit-tests	47s
tests / integration-tests	5m 26s
build / build-binary (windows/arm64)	30s
build / build-docker-images-and-push	0s
build / build-binary (windows/amd64)	28s
build / build-binary (darwin/amd64)	36s
build / build-binary (darwin/arm64)	35s
build / build-binary (linux/amd64)	20s
build / build-binary (linux/arm64)	29s
build / build-binary (linux/arm/v6)	34s
build / build-binary (linux/arm/v7)	36s
build / build-binary (linux/ppc64le)	35s
build / build-binary (linux/riscv64)	34s
build / build-binary (linux/s390x)	29s
docs	0s
	11m 59s

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