How can one avoid the unlawful (haram) and the intermingling of the lawful (halal) in money earned from government work, especially with the insufficiency of the basic salary and living expenses?

You have done well in fearing the unlawful and acquiring unlawful wealth, for piety involves abandoning what is doubtful, in compliance with the Prophet's (peace be upon him) saying: "Leave what makes you doubt for what does not make you doubt," and his saying: "Whoever guards against doubtful matters has safeguarded his religion and his honor." However, the source and type of money you spend are not clear to us, and how it can be legal while its permissibility in Islamic law is unknown. Therefore, we request clarification so that we can provide an answer.