The error is saying you didn’t provide a main() function. Looking at your code I see the following:
int main();
This is a function declaration not a definition. It looks like you’ve forgotten the curly braces around the body of your main() function.
I also see you keep putting a semicolon after the closing bracket of all your functions. This isn’t required and makes me wonder what terrible resource you’re using to learn C.
Edit:
Your fillWordsearch() function has unbalanced curly braces. It’s missing a } brace somewhere.
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solved Why does this Happen? (C programming Error)