Change Details

Replaced some strings/numbers that were all over the place with some enum-like constants. I concentrated my efforts on Worker, TransportPlan. the difficulty. Furthermore I replaced some let' with const` to satisfy the linter

Replaced some strings/numbers that were all over the place with some enum-like constants. I concentrated my efforts on Worker, TransportPlan. the difficulty. Furthermore I replaced some `let` with const` to satisfy the linter

Replaced some strings/numbers that were all over the place with some enum-like constants. I concentrated my efforts on Worker, TransportPlan. the difficulty. Furthermore I replaced some let'`let` with const` to satisfy the linter