refactor: components struture

packages/utils/src/dates.ts

@@ -12,6 +12,7 @@ export const getISODate = (date: Date): string => {
 /**
  * Calculates the age of a person based on their birth date.
  * @param birthDate
+ * @returns
  */
 export const getAge = (birthDate: Date): number => {
   const today = new Date()

packages/utils/src/strings.ts

@@ -1,3 +1,9 @@
+/**
+ * Capitalize the first letter of a string.
+ * @param string
+ * @returns
+ * @example capitalize("hello, world!") // "Hello, world!"
+ */
 export const capitalize = (string: string): string => {
   return string.charAt(0).toUpperCase() + string.slice(1)
 }