Palantir

Implement a swipe left function that moves numbers to the left and merges equal numbers.

Function Signature:

function swipeLeft(numbers: number[]): number[]

Requirements:

• Move all numbers to the leftmost possible position
• Merge equal adjacent numbers when moving left
• Fill remaining positions with zeros
• Process merges in order from left to right

Examples:

Input: [2,2,2,2]
Output: [8,0,0,0]
Explanation: 
1. First merge: [4,4,0,0]
2. Second merge: [8,0,0,0]

Input: [0,2,2,0]
Output: [4,0,0,0]
Explanation:
1. Move left: [2,2,0,0]
2. Merge: [4,0,0,0]