Given a snake_case formatted string, convert it to camelCase format. The first word remains in its original form, and the first letter of each subsequent word is capitalized with the rest in lowercase. Return null for null input and an empty string for empty input.
Examples:
Input: input = 'hello_world'
Output: 'helloWorld'
Explanation: The underscore is removed and 'w' is capitalized
Input: input = 'first_name_value'
Output: 'firstNameValue'
Explanation: Each word after the first has its first letter capitalized
Input: input = 'hello'
Output: 'hello'
Explanation: No underscores present, string is returned unchanged
Input: input = null
Output: null
Input: input = ''
Output: ''
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