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Beginner logic development
if(RemoveSpaces.checked)
{
    RemoveSpaces(string inputString);
    // After removing spaces do the other operations
}

else if (RemoveSpecialChars.checked)
{
    RemoveSpecialChars(string inputString);
    // Do other processing
}

public static class StringOperations
{
    public static string RemoveSpaces(string sourceString)
    {
        string convertedString = "";
        //some operations
        return convertedString;
    }

    public static string RemoveCharacters(string sourceString, params char[] charactersToRemove)
    {
        string convertedString = "";
        //some operations
        return convertedString;
    }

    public static string RemoveAnyNumbers(string sourceString)
    {
        string convertedString = "";
        //some operations
        return convertedString;
    }

    public static string ConvertToCamelCase(string sourceString)
    {
        string convertedString = "";
        //some operations
        return convertedString;
    }
}

string start = "a b 3 4 5.7";
string noSpace = start.Replace(" ", "");
string noDot = noSpace.Replace(".", "");
string noNumbers = Regex.Replace(noDot, "[0-9]", "");

Console.WriteLine(start);
Console.WriteLine(noSpace);
Console.WriteLine(noDot);
Console.WriteLine(noNumbers);

"a b 3 4 5.7"  // start
"ab345.7"  // noSpace
"ab3457" // noDot
"ab" // noNumbers