LCSSubStr-a function that return two string's largest common part

a function that return two string's largest common part

% Usage:
% [ret]=LCSubstr(s,t)
% s: input string 1
% t: input string 2
% ret: Largest Common String
% z: Largest Common String Length
% L : Compare matrix
% Example:
% >>a='This is very common string';
% >>b='string is very common';
% >>[ret]=LCSubstr(a,b)
% ret =
%
% very common