Write a program in C language using functions, which multiply any two matrices of size 3 x 3. User should input these matrices.

Here is a program in C language that multiplies two 3x3 matrices using functions. The user is prompted to input the matrices, and the multiplication is performed using a dedicated function.

```c
#include <stdio.h>

// Function to input a 3x3 matrix
void inputMatrix(int matrix[3][3], const char *name) {
    printf("Enter elements of matrix ___ ___ __________ ______ ____ ________ _____ _________.
_______ ______ ___ ____ __________ ___ _____ ________.
_____ _____ ______ _________ __________ ___ ______ _____ ________.
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___ __________ _____ ______ _______ ______ ___ ________.
____ __________ _________ ___ _______ _____ __________ ______ _______ ________ _________.
______ ________ _________ ______ _______.
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__________ _______ ______ ________ _____ ____ ______ ____ ________.
____ ____ ___ _______ __________ ________ _________.
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____ _____ _______ _____ ____ _________ ______ __________.
_____ ________ ___ ________ ________.
__________ _________ _______ ___ _______ _______ ____ _____ ______.
_____ ___ _______ _____ __________ ________ ________ __________ _______ _____ ___ ____.
_____ ___ _________ ____ ___.
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________ _________ ___ ________ ____ ____ ______ ___.
_________ _____ ________ ____ ___ ________.
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__________ _______ _________ __________ ____ ______ _________ ___ _______ ________.
__________ ____ ____ _______ ____.
____ ________ ________ ____ _____.
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________ __________ __________ _______ ____ __________.
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________ _____ _________ ____ _________ __________ _______.
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______ _______.
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