Please improve the test suite. There is only one test case—three is a recommended minimum, though more may be necessary to completely and adequately test what is being asked.
Penny flipping - calculate winning probability (easy)
Sum the numbers on the main diagonal
Matrix Ax=B problem
Matrix element wise multiplication
Simple String Concatenation
Vector indexing: lower than mean
Find the sum of the largest two elements in a vector
String Delimination and Outputting
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