def joinWords(stringArr,delimiter): res = "" for i in range(len(stringArr)): res += stringArr[i] + delimiter print(res.substring(0, res.length - 1))

The code above does the following:
    1. Define a function that takes 2 arguments, an Array of Strings and a delimiter
    2. Initialize a variable named res to an empty string
    3. Loop over the array using a for loop
    4. Concatenate each element with the delimiter and add it to res
    5. Print the result without the last delimiter