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Logic/parser: refactor `ParserUtil` methods (#167)

* Logic/parser: extract `arePrefixesPresent(...)` to `ParserUtil`

Many command parsers (such as `AddCommandParser`,
`PlannerAddCommandParser`, `RequriementRemoveCommandParser`) have the
same `arePrefixesPresent(...)` implementation.

Let's extract the `arePrefixesPresent(...)` to `ParserUtil` to reduce
duplicate code.

* logic/parser: simplfy `ParserUtil#parseCorequisites(...)` implementation

`ParserUtil#parseCorequisites(...)` is simply a syntactic sugar for
`ParserUtil#parseCodes(...)`.

Let's update `ParserUtil#parseCorequisites(...)` to call
`parseCodes(...)` internally instead of duplicating code.

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