replace.js

// Replacing Letters with Hashes

// Write a function that replaces all letters within a specified range with the hash symbol #.

// Examples
// replace("abcdef", "c-e") ➞ "ab###f"

// replace("rattle", "r-z") ➞ "#a##le"

// replace("microscopic", "i-i") ➞ "m#croscop#c"

// replace("", "a-z") ➞ ""

// Notes
// 1 - The range will always be in order, a.k.a. for m-n, character m will always come before or equal n.
// 2 - Strings will be in lower case letters only.
// 3 - Return an empty string if the input is an empty string.