
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Removes leading and trailing spaces correctly")]
        public void Removes_LeadingAndTrailingSpaces()
        {
            Assert.Equal("Hello world", Program.CleanUpSentence("   hello world   "));
        }

        [Fact(DisplayName = "Replaces multiple spaces between words with single space")]
        public void Replaces_MultipleSpacesWithSingleSpace()
        {
            Assert.Equal("A b c", Program.CleanUpSentence("A    b      c"));
        }

        [Fact(DisplayName = "Replaces standalone 'u' and 'r' with 'you' and 'are'")]
        public void Replaces_StandaloneUAndR()
        {
            Assert.Equal("Hey you are awesome!", Program.CleanUpSentence("  hey   u   r   awesome!   "));
            Assert.Equal("Are you coming?", Program.CleanUpSentence(" r u coming? "));
            Assert.Equal("You are the best", Program.CleanUpSentence("   u are   the   best   "));
        }

        [Fact(DisplayName = "Capitalizes only the first letter and lowercases the rest")]
        public void Capitalizes_FirstLetter_Only()
        {
            Assert.Equal("You are great", Program.CleanUpSentence("   U ARE GREAT   "));
            Assert.Equal("Hello", Program.CleanUpSentence("   hELLO   "));
        }

        [Fact(DisplayName = "Handles sentences with only 'u' or 'r' at start or end")]
        public void Handles_OnlyUorR_AtStartOrEnd()
        {
            Assert.Equal("You", Program.CleanUpSentence("   u   "));
            Assert.Equal("Are", Program.CleanUpSentence(" r "));
            Assert.Equal("Hello you", Program.CleanUpSentence(" hello u "));
            Assert.Equal("Are you", Program.CleanUpSentence(" r u "));
        }
    }
}

ProgramTests.cs

Master the essentials of string manipulation, text parsing, and efficient text processing in C#. This course guides you from the basics of working with strings to advanced text analysis and formatting, using engaging real-world examples and hands-on challenges.

Explore the basics of strings in C#, including creation, concatenation, and essential properties. Practice manipulating and analyzing text with beginner-friendly challenges.

Advance your skills with string formatting, splitting, trimming, and replacing text. Tackle real-world parsing and formatting tasks.

Apply your string skills to analyze text, check for palindromes, perform frequency analysis, and implement basic ciphers.

Challenge: Clean Up User Input

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