Given a list of integers, return a new list where each element is the cumulative sum of all elements from the beginning of the input list up to and including the current position. This is called a running total or prefix sum.
Return an empty list if the input is null or empty.
Examples:
Input: numbers = [1, 2, 3, 4]
Output: [1, 3, 6, 10]
Explanation: 1, 1+2=3, 1+2+3=6, 1+2+3+4=10
Input: numbers = [5]
Output: [5]
Explanation: Single element returns a single element list
Input: numbers = []
Output: []
Explanation: Empty input returns empty list
Input: numbers = [10, -3, 7]
Output: [10, 7, 14]
Explanation: 10, 10+(-3)=7, 7+7=14
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