Oh no! Some of the developers used snake_case instead of camelCase in our Java application. We created a script for renaming variable names but one part is missing – transforming actual value to camelCase format. 

Can you help us with transformation?

These are requirements:

1. An algorithm needs to transform the given String value from snake_case to camelCase format.
2. It needs to have a method named convertToCamelCase that accepts String type as a parameter. A method needs to return transformed value.
3. Words inside a given value are separated either with _ or –.
4. Cases that need to be considered as well are the ones where the separator is placed at the beginning or at the end of the value.

Input:

 public static void main(String[] args) {
    covertToCamelCase("animal-zebra");
    covertToCamelCase("this-is-animal");
    covertToCamelCase("has-tail-");
    covertToCamelCase("-tail-is-long-");
}

Output:

animalZebra
thisIsAnimal
hasTail
tailIsLong