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Implement (prоvide pseudоcоde for) two librаry functions: redirectAndSаve аnd swapFileDesriptors. redirectAndSave takes two file descriptor numbers fd1 and fd2 and returns a new file descriptor number. Assuming that both fd1 and fd2 are valid at the time of the call, it performs the following: 1) Initializes a new file descriptor fd3 value, i.e., creates a new entry in the file descriptor table, and makes it point to the same file table entry pointed by fd2 at the time of the call. And returns fd3 as the return value. 2) Redirects fd2 to fd1 in a way that the reference count of the file table entry pointed by fd2 at the time of the call gets decremented. swapFileDesriptors takes two file descriptor numbers fd1 and fd2. Assuming that both fd1 and fd2 are valid at the time of the call, it makes fd1 point to the file table entry pointed by fd2 at the time of the call and makes fd2 point to the file table entry pointed by fd1 at the time of the call. By the time the function returns the reference counts of the file table entries pointed by fd1 and fd2 at the time of the call should not have changed.