How should I practice Convert Snake Case Variables to Camel Case?

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Convert Snake Case Variables to Camel Case

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Problem statement

Given a string text containing space-separated variable names written in snake_case, convert every variable name to camelCase and return the resulting string.

For each variable name:

Preserve every leading and trailing underscore.
Remove each underscore between lowercase words and capitalize the first letter of the following word.
Leave a variable name with no internal underscore unchanged.

Keep the variable names in their original order and keep the single spaces between them.

Function

toCamelCase(text: String) → String

Examples

Example 1

text = "__variable_one__ _variable_two variable_three"return = "__variableOne__ _variableTwo variableThree"

The leading and trailing underscores stay in place. The internal underscores are removed, and the letters o and t that follow them become uppercase.

Example 2

text = "foo_bar __hello_world_ plain"return = "fooBar __helloWorld_ plain"

foo_bar becomes fooBar, __hello_world_ becomes __helloWorld_, and plain is unchanged.

Constraints

1 <= text.length <= 10^5.
text contains lowercase English letters, underscores, and single spaces.
Variable names are separated by exactly one space, with no leading or trailing space.
Each variable name contains at least one letter.
After removing its leading and trailing underscores, each variable name contains one or more non-empty lowercase words separated by single underscores.