Please improve the test suite. There are two glaring problems. First, there is only one test case—it is recommended that at least three be provided, though more are often necessary to prevent hard-coded workarounds. Second, do not provide the solution in the test case(s). For such a problem, the answer should be calculated beforehand and provided as a predefined number to hide the solution. Furthermore, candidate functions can be checked against the solution using an adequate error bound (perhaps within 1E-3) rather than isequal().
Add two numbers
Do you like your boss?
Find Out sum of principal diagonal element of given matrix
Simple String Concatenation
More Simple String Concatenation
Check if inputted variable is a string or a number
Find the mean of two vectors
Sum two matrices
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