I suggest adding additional test cases to make the problem stronger.
Doubling elements in a vector
Change the sign of even index entries of the reversed vector
Find out missing number from a vector of 9 elements
Rounding off numbers to n decimals
MATLAB Basic: rounding IV
Vector Element Multiplication
More Simple String Concatenation
Replace 0 indices in array with 1's
String Delimination and Outputting
Simple String Concatenation
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