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().
Reverse Run-Length Encoder
Determine the square root
Rounding off numbers to n decimals
Replace 0 indices in array with 1's
String Delimination and Outputting
Check if inputted variable is a string or a number
Sum two matrices
Simple String Concatenation
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