How to split a C program into multiple files?

How to split a C program into multiple files?

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c

ld.exe: cannot open output file ... : Permission denied

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c

Warning: array subscript has type char

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c

glibconfig.h no such file or directory

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c

How do you install GTK+ 3.0 on Windows?

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c

Code::Blocks - warning: GDB: Failed to set controlling terminal: Operation not permitted

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