Add solution for Challenge 6 by Raycas96 (#1566)

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PR: #1566
Author: @Raycas96

Author: Raycas96

challenge-6/submissions/Raycas96/solution-template.go

@@ -0,0 +1,34 @@
+// Package challenge6 contains the solution for Challenge 6.
+package challenge6
+
+import (
+		"strings"
+		"unicode"
+)
+
+// CountWordFrequency takes a string containing multiple words and returns
+// a map where each key is a word and the value is the number of times that
+// word appears in the string. The comparison is case-insensitive.
+//
+// Words are defined as sequences of letters and digits.
+// All words are converted to lowercase before counting.
+// All punctuation, spaces, and other non-alphanumeric characters are ignored.
+//
+// For example:
+// Input: "The quick brown fox jumps over the lazy dog."
+// Output: map[string]int{"the": 2, "quick": 1, "brown": 1, "fox": 1, "jumps": 1, "over": 1, "lazy": 1, "dog": 1}
+func CountWordFrequency(text string) map[string]int {
+    counts := make(map[string]int)
+
+	text = strings.ToLower(text)
+    text = strings.ReplaceAll(text, "'", "")
+	words := strings.FieldsFunc(text, func(r rune) bool {
+		return !unicode.IsLetter(r) && !unicode.IsDigit(r)
+	})
+
+	for _, word := range words {
+		counts[word]++
+	}
+
+	return counts
+}