Convert String to camelCase

Create a function that converts dash/underscore delimited words into camel casing. The first word within the output should be capitalized only if the original word was capitalized.

Examples

toCamelCase("A-B-C") ➞ "ABC"

toCamelCase("the-stealth-warrior") ➞ "theStealthWarrior"

toCamelCase("The_Stealth_Warrior") ➞ "TheStealthWarrior"

Notes

An empty string as input "" should return an empty string.