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bool Judge(string s1, string s2)
{
if (string.IsNullOrEmpty(s1) || string.IsNullOrEmpty(s2)) return true;
if (s1.Length < s2.Length) return true;
var ci = StringComparison.InvariantCulture;
var b1 = string.Compare(s1.Substring(0, s2.Length), s2, ci) == 0;
var b2 = s1.StartsWith(s2, ci);
return b1 == b2;
}