StringExtensions.cs

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namespace UnityEngine
{
    
    public static class StringExtensions
    {
 
        public static string EnsureEndsWithDot(this string str)
        {
            if (!str.EndsWith(".")) return str + ".";
            return str;
        }
    
        public static bool IsNullEmptyOrWhiteSpace(this string str)
        {
            return /*string.IsNullOrEmpty(str) ||*/ string.IsNullOrWhiteSpace(str); // 'IsNullOrWhiteSpace' already checks for emptiness
        }
    
        public static bool IsNullOrEmpty(this string str)
        {
            return string.IsNullOrEmpty(str);
        }
    
    }
}