What is the ruling on circumventing the leave system in government companies to accumulate leave days and convert them into money upon retirement, and what is the ruling on strong jokes and pranks between friends, and calling each other by offensive nicknames and insults, if everyone is agreeable and there are no grudges?

The employee must adhere to the contract signed with the employer and not violate it, as Allah says: "O you who have believed, fulfill [all] contracts," and as the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions." What some employees do by taking an undeserved leave through deception and falsification does not permit them to be absent, and they bear the sin of negligence. They are not entitled to the portion of the salary corresponding to the time they violated. However, this does not prevent the employee from benefiting from the compensation paid to them for vacation days they did not take. There are two rights: the employer's right to the employee's adherence to the specified time, and the employee's right to compensation for vacation days they are entitled to according to the contract. There is no necessary connection between the two rights.