C allows statements of the form #include filename which reads filename and inserts its contents in place of the include statement. Include statements may be

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C allows statements of the form
#include filename
which reads filename and inserts its contents in place of the include statement. Include statements may be nested; in other words, the file filename may itself contain an include statement, but, obviously, a file can't include itself in any chain. Write a program that reads in a file and outputs the file as modified by the include statements.