strcat.m undefined problem in 5.2.0

[patpin]

Hello, I use Octave 5.2.0 in GUI.
After using Octave for 2 weeks I'm suddenly confronted with errors I didn'
had before with the same code.
Also today I suddenly received a message not finding the 'close' in this
code :   clear ; close all; clc; 
error: 'strcat' undefined near line 44 column 25
error: called from
    handleStooq at line 44 column 24
    testinvoer03 at line 69 column 1
>> EXEC_PATH
ans =
C:\Octave\OCTAVE~1.0\mingw64\bin;C:\Octave\OCTAVE~1.0\mingw64\notepad++;C:\Octave\OCTAVE~1.0\mingw64\libexec\octave\5.2.0\site\exec\x86_64-w64-mingw32;C:\Octave\OCTAVE~1.0\mingw64\lib
exec\octave\api-v53\site\exec\x86_64-w64-mingw32;C:\Octave\OCTAVE~1.0\mingw64\libexec\octave\site\exec\x86_64-w64-mingw32;C:\Octave\OCTAVE~1.0\mingw64\libexec\octave\5.2.0\exec\x86_64-w64-m
ingw32;C:\Octave\OCTAVE~1.0\mingw64\bin
>> strcat("ddd" ,"fff")
error: 'strcat' undefined near line 1 column 1

I found the strcat file strcat.m in
C:\Octave\Octave-5.2.0\mingw64\share\octave\5.2.0\m\strings.

Obviously the  not in the exec_path. I don't know how to put it there and if
there's a chance this will fix it. Some advise please.



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