Given two input matrices, x and y, check if their inner dimensions match.

• If they match, create an output variable z which contains the product of x and y
• Otherwise, z should contain a custom string message

Example:

x = [1 2;3 4]
y = [5;6]

z = [17;39]

x = [1 2 3;4 5 6]
y = [2 5;3 6]

z = "Have you checked the inner dimensions?"

OR

z = "The inner dimensions are 3 and 2. Matrix multiplication is not possible"

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NOTE - An example of combining numbers and strings together is shown below:

x = "The sum of " + 4 + " and " + 3 + " equals " + 7

x = 

      "The sum of 4 and 3 equals 7"