Convert snake_case variable names to lowerCamelCase

Write a function:

def solution(src)

that receives a string src representing source code and returns the same string with all instances of snake_case converted to lowerCamelCase, preserving any leading or trailing underscores.

Requirements

• Leading underscores should be preserved
• Trailing underscores should be preserved
• Only single underscores separate words in snake_case
• All variables are in lowercase English letters
• Apply to all instances of snake_case in src, not just variables

Example

solution("This is the doc_string for __secret_fun") 
# ➞ "This is the docString for __secretFun"

Constraints

• 0 ≤ src.length ≤ 100000

Input

• src: string, source code text containing snake_case names

Output

• string, with all snake_case names converted to lowerCamelCase while preserving formatting rules

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