var testString = "ABCD efgh iJkl";testString = string.Join(" ", testString.Split(' ').Select(CapitalizeFirstLetter).ToArray());private static string CapitalizeFirstLetter(string str){if (string.IsNullOrWhiteSpace(str)) return str;return str.Length == 1 ? str.ToUpper() : char.ToUpper(str[0]) + str.Substring(1).ToLower();}
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