moves-in-squared-strings-iv

Moves in squared strings (IV)

You are given a string of n lines, each substring being n characters long: For example:

s = "abcd\nefgh\nijkl\nmnop"

We will study some transformations of this square of strings.

• Symmetry with respect to the main cross diagonal: diag_2_sym (or diag2Sym or diag-2-sym)

diag_2_sym(s) => "plhd\nokgc\nnjfb\nmiea"

• Counterclockwise rotation 90 degrees: rot_90_counter (or rot90Counter or rot-90-counter)

rot_90_counter(s)=> "dhlp\ncgko\nbfjn\naeim"

• selfie_diag2_counterclock (or selfieDiag2Counterclock or selfie-diag2-counterclock) It is initial string + string obtained by symmetry with respect to the main cross diagonal + counterclockwise rotation 90 degrees .

s = "abcd\nefgh\nijkl\nmnop" --> 
"abcd|plhd|dhlp\nefgh|okgc|cgko\nijkl|njfb|bfjn\nmnop|miea|aeim"

or printed for the last:

selfie_diag2_counterclock
abcd|plhd|dhlp
efgh|okgc|cgko
ijkl|njfb|bfjn
mnop|miea|aeim

Task

• Write these functions diag_2_sym, rot_90_counter, selfie_diag2_counterclock

and

• high-order function oper(fct, s) where

• fct is the function of one variable f to apply to the string s (fct will be one of diag_2_sym, rot_90_counter, selfie_diag2_counterclock)

Example

s = "abcd\nefgh\nijkl\nmnop"
oper(diag_2_sym, s) => "plhd\nokgc\nnjfb\nmiea"
oper(rot_90_counter, s) => "dhlp\ncgko\nbfjn\naeim"
oper(selfie_diag2_counterclock, s) => "abcd|plhd|dhlp\nefgh|okgc|cgko\nijkl|njfb|bfjn\nmnop|miea|aeim"

Note

• The form of the parameter fct in oper changes according to the language. You can see each form according to the language in "Your test cases".
• It could be easier to take these katas from number (I) to number (IV)
• Bash Note: The ouput strings should be separated by \r instead of \n. See "Sample Tests".