Concatenate different sizes Cell Matrix

Concatene cell matrix (row-wise or column-wise) regardless of the different sizes

% Concatene cell matrix (row-wise or column-wise) regardless of the different sizes, filling the missing cells with NaN.
% This function generalize previous functions "K_cRows" and "K_cCols".
%
% c=K_cCells(b,a,'row') or c=K_cCells(b,a) or c=K_cCells(b,a,"everyCharOrNumber") for row-wise;
% c=K_cCells(b,a,'col') for column-wise;

A={'a11' 'a12';'a21' 'a22'}

A =

'a11' 'a12'
'a21' 'a22'

>> B={'b11' 'b12' 'b13'; 'b21' 'b22' 'b32'; 'b31' 'b32' 'b33'}

B =

'b11' 'b12' 'b13'
'b21' 'b22' 'b32'
'b31' 'b32' 'b33'

>> C=K_cCells(A,B)

C =

'a11' 'a12' []
'a21' 'a22' [ ]
'b11' 'b12' 'b13'
'b21' 'b22' 'b32'
'b31' 'b32' 'b33'

>> C=K_cCells(A,B,'col')

C =

'a11' 'a12' 'b11' 'b12' 'b13'
'a21' 'a22' 'b21' 'b22' 'b32'
[ ] [ ] 'b31' 'b32' 'b33'