[sda-cli] refactor path constructions to use the "filepath" library instead of string concatenation #564
Description
Please describe the feature
As a developer, I want all constructions of paths to use the "filepath" library (e.g. filepath.Join) so that the risk for incorrect paths is reduced.
Acceptance criteria
- String concatenation is not used for constructions of paths
- Existing unit test pass
Additional context
Examples of occurances:
- https://github.com/NBISweden/sda-cli/blame/8e07b62f74cfcb1a14ee4c42826772fa8b9cd635/helpers/helpers.go#L443
- https://github.com/NBISweden/sda-cli/blob/main/download/download.go#L206
- https://github.com/NBISweden/sda-cli/blame/8e07b62f74cfcb1a14ee4c42826772fa8b9cd635/download/download.go#L243