02. Reveal Triangles

function solve (input) {

    var result = input.slice(0);

    for (var i = input.length - 1; i >= 1; i -= 1) {
        for (var j = 0; j < input[i].length - 2; j += 1) {
            if (input[i][j] === input[i][j+1] && input[i][j] === input[i][j+2]) {
                if(input[i][j] === input[i-1][j+1]) {
                    result[i] = result[i].substr(0, j) + '***' + result[i].substr(j+3);
                    result[i-1] = result[i-1].substr(0, j+1) + '*' + result[i-1].substr(j+2);
                }
            }
        }
    }


    for(var str in result) {
        console.log(result[str]);
    }

}