lib/classes/Variables.js/Variables/overwrite
class Variables:  overwrite(variableStringsString) {
    let finalValue;
    const variableStringsArray = variableStringsString.split(',');
    variableStringsArray.find(variableString => {
      finalValue = this.getValueFromSource(variableString);
      return (typeof finalValue !== 'undefined' && finalValue !== null);
    });

    return finalValue;
  }