feat(solutions): add acronyms/cs/with-loops

challenges/acronyms/solutions/cs/with-loops/README.md

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+# acronyms/cs/with-loops
+
+Created by [@Divlo](https://github.com/Divlo) on 10 September 2021.

challenges/acronyms/solutions/cs/with-loops/Solution.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Solution
+{
+    class Program
+    {
+        static void Main()
+        {
+            string line = Console.ReadLine();
+            Console.WriteLine(GetAcronym(line));
+        }
+
+        /// <summary>
+        /// Returns the acronym of the given string.
+        /// </summary>
+        /// <param name="line">The string to get the acronym of.</param>
+        /// <returns>The acronym of the given string.</returns>
+        public static string GetAcronym(string line)
+        {
+            line = ReplaceString(line, "\"", "");
+            string[] words = SplitString(line, " ");
+            string acronym = "";
+            foreach (string word in words)
+            {
+                acronym += word[0].ToString().ToUpper();
+            }
+            return acronym;
+        }
+
+        /// <summary>
+        /// Splits a string into words.
+        /// </summary>
+        /// <param name="source">The string to split.</param>
+        /// <param name="delimiter">The delimiter to split the string by.</param>
+        /// <returns>An array of words.</returns>
+        public static string[] SplitString(string source, string delimiter)
+        {
+            List<string> result = new List<string>();
+            string current = "";
+            for (int index = 0; index < source.Length; index++)
+            {
+                string character = source[index].ToString();
+                if (character == delimiter)
+                {
+                    result.Add(current);
+                    current = "";
+                }
+                else
+                {
+                    current += character;
+                }
+            }
+            result.Add(current);
+            return result.ToArray();
+        }
+
+        /// <summary>
+        /// Replaces all instances of a string with another string.
+        /// </summary>
+        /// <param name="source">The source string.</param>
+        /// <param name="oldValue">The string to replace.</param>
+        /// <param name="newValue">The string to replace with.</param>
+        /// <returns>The new string.</returns>
+        public static string ReplaceString(string source, string oldValue, string newValue)
+        {
+            string result = "";
+            for (int index = 0; index < source.Length; index++)
+            {
+                if (source[index].ToString() == oldValue)
+                {
+                    result += newValue;
+                }
+                else
+                {
+                    result += source[index];
+                }
+            }
+            return result;
+        }
+    }
+}