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6b39c6b1bf
Whenever the prompt is printed, we write a line's worth of space characters to the terminal to ensure that the prompt ends up on a new line even if there is dangling output on the current line. We write these to the stderr, which is unbuffered, so each putc() call would come with the overhead of a system call. Let's use a buffer + fwrite() instead, since heap allocation is much faster.