`toCamelCase` handlebar helper should not transform already camelCase string

[Peter Marosi]

Describe the bug
We added recently toCamelCase helper but it should not touch an already camelCase transformed string

Expected behavior
Need to added:

        // Check if input string is already in camelCase
        if (/^[a-z][a-zA-Z0-9]*$/.test(input)) {
            return input
        }