character concatenation

[JiananJian]

file and line:

CVX/cvx_startup.m

Line 72 in a0a7759

mpath2 = mpath + fs; npath2 = length(mpath2);

code: mpath2 = mpath + fs;

environment: Windows 11

issue: both mpath (which is cvx___.where) and fs (which is '') are of type char. As neither is a string, MATLAB interprets the + operation as addition (in ascii value) not concatenation, while the authors' intention is clearly concatenation.