Usage: cppi [FILE]
or: cppi -c [OPTION] [FILE]...
Indent the C preprocessor directives in FILE to reflect their nesting and ensure that there is exactly one space character between each #if, #elif, #define directive and the following token, and write the result to standard output. The number of spaces between the `#' and the following directive must correspond to the level of nesting of that directive. With no FILE, or when FILE is -, read standard input.
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