Fixed a problem where we were not considering all possible occurrences of a string in another string in TextUtil::FindSubstring().
Fixed a problem where we were not considering all possible occurrences of a string in another
string in TextUtil::FindSubstring().

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools