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().
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The Goldbach Conjecture
Change the sign of even index entries of the reversed vector
Reverse a string
String Delimination and Outputting
More Simple String Concatenation
Find the index of the lowest number in a matrix
Replace 0 indices in array with 1's
Check if inputted variable is a string or a number
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