<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Edit the given function so that it returns the sum of all numbers in the input array.
def get_sum(arr):
    return arr[0]<|im_end|>
<|im_start|>assistant
def get_sum(arr):
    sum = 0
    for item in arr:
        sum += item
    return sum<|im_end|>
