Does "All the data still" mean, that the fields are not re-ordered? A lot of the solutions change the order of the fields.
Currently, Matlab has the function renameStructField.
When I run the test suite on my computer, this solution works. It passes the test suite.
This fails, if the fieldname to be replaced appears as part of another fieldname. Example: S.ab=1; S.a=2; renamefield(S, 'a', 'c')
Remove all the words that end with "ain"
Implement a ROT13 cipher
Project Euler: Problem 6, Natural numbers, squares and sums.
Find a Pythagorean triple
Determine if input is odd
Reverse Run-Length Encoder
Find state names that start with the letter N
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