Fix lint errors

[ktprograms]

• Set Swift version for linter to 5.3 (@akinwale's current highest available)
• Disable redundantReturn,andOperator,wrap lints.
  • redundantReturn requires removing return statements on single line functions, which is harder to read.
  • andOperator requires using , instead of && in conditions, which makes the code not C-like.
  • wrap is disabled because long lines are a necessary evil sometimes.

[ktprograms]

@akinwale Do you think enabling it on master is necessary, or maybe you should just run SwiftFormat locally before pushing your changes?