Write a program in C language to perform the matrix merging operation of two matrices. A matrix is a two-dimensional structure. For example,

is a 2 3 matrix (i.e., 2 rows and 3 columns).

Please write a program that receives two matrices (whose elements are integers) from users, and then computes and prints the result of the matrix merging operation of them. Your program should first let the user specify the size of each matrix (i.e., the number of rows and the number of columns of each matrix), then let the user input the value of each element of each matrix. Suppose the size of each matrix is at most 1010 (i.e., at most 10 rows and at most 10 columns).

Your program should check the validity of inputs and ask the users to re-input every detected invalid input. The following cases of invalid inputs should be considered:

*The number of columns/rows of the matrix is not an integer in the range [1, 10]

*The value of each element is not a positive integer

*The number of columns of matrix A does not equal the number of rows of Matrix B