goal-interpreter.strings.js

/**
 * @param {string} command
 * @return {string}
 */
var interpret = function(command) {
    let output = '';
    
    for(let i = 0; i < command.length; i++) {
        if(command[i] === "G") {
            output += "G"
        } else if (command[i] === "(") {
                if(command[i+1] === ")") {
                    output += "o"
                } else if(command[i+1] === "a" && command[i+2] === "l" && command[i+3] === ")") {
                    output += "al"
                }
        }
    }
    return output;
};