C#: Combine two given strings. If there are any double character in new string then omit one character

Last update on June 27 2025 13:06:25 (UTC/GMT +8 hours)

Combine Strings Removing Duplicates

Write a C# Sharp program to combine two given strings (lowercase). If there are any double characters in the string, omit one character.

Visual Presentation:

C# Sharp: Basic Algorithm Exercises - Combine two given strings.

Sample Solution:-

C# Sharp Code:

using System; // Importing the System namespace

namespace exercises // Defining a namespace called 'exercises'
{
    class Program // Defining a class named 'Program'
    {
        static void Main(string[] args) // The entry point of the program
        {
            // Output the results of the test function with different strings as arguments
            Console.WriteLine(test("abc", "cat")); // Pass "abc" and "cat" as arguments to the test function
            Console.WriteLine(test("python", "php")); // Pass "python" and "php" as arguments to the test function
            Console.WriteLine(test("php", "php")); // Pass "php" and "php" as arguments to the test function
            Console.ReadLine(); // Wait for user input before closing the console window
        }

        // Function definition of the test function that takes two strings 's1' and 's2' and returns a string
        public static string test(string s1, string s2)
        {
            // Check if 's1' is an empty string
            if (s1.Length < 1)
            {
                return s2; // If 's1' is empty, return 's2'
            }

            // Check if 's2' is an empty string
            if (s2.Length < 1)
            {
                return s1; // If 's2' is empty, return 's1'
            }

            // Check if the last character of 's1' does not match the first character of 's2'
            // If true, concatenate 's1' and 's2'; otherwise, concatenate 's1' and 's2' excluding the first character of 's2'
            return !s1.EndsWith(s2.Substring(0, 1)) ? s1 + s2 : s1 + s2.Substring(1);
        }
    }
}

Sample Output:

abcat
pythonphp
phphp

Flowchart:

Go to:

PREV : First and Last Char of Two Strings.
NEXT : Swap Last Two Characters.

C# Sharp Code Editor:

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