Convert a string with spaces or underscores to camelCase format. The first word should be lowercase, and subsequent words should have their first letter capitalized with no separators.
Examples:
Input: input = 'hello world'
Output: 'helloWorld'
Explanation: First word 'hello' stays lowercase, second word 'world' becomes 'World'
Input: input = 'first_name'
Output: 'firstName'
Explanation: Convert underscore-separated string to camelCase
Input: input = 'ANNUAL REVENUE'
Output: 'annualRevenue'
Explanation: First word becomes lowercase, second word gets first letter capitalized
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