feat: added unique.letters.count.R

string_manipulation/unique.letters.count.R

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+# Ask for user input
+input.string <- readline(prompt = "Enter a string: ")
+
+# Convert to lowercase and remove non-letter characters
+# [^a-zA-Z] ensures both uppercase and lowercase letters are kept before conversion
+clean.string <- tolower(gsub("[^a-zA-Z]", "", input.string))
+
+# Split string into individual letters
+letters.vec <- strsplit(clean.string, "")[[1]]
+
+# Get unique letters
+unique.letters <- unique(letters.vec)
+
+# Count occurrences of each unique letter (only for unique ones)
+letter.counts <- table(letters.vec)[unique.letters]
+
+# Display results
+cat("Unique letters and their counts:\n")
+for (letter in unique.letters) {
+  cat(letter, ":", letter.counts[letter], "\n")
+}