Consider two matrices stored in two files:
`input_file_A.txt` and `input_file_B.txt`.

The matrices have dimensions 80 × 100 and 100 × 90, respectively.

Write a C program to multiply these two matrices and compute the resulting matrix ( C = AB ), which will have dimensions 80 × 90.

While performing the computation, create 5 threads and distribute the workload among them. Finally, store the resulting matrix in another file named `output_C.txt`.

Insert the sleep(1) function at appropriate points in the program so that it demonstrates that the actual execution time is reduced by apprx. 5 times.