Map data = {
  "blogs details": "blogs details",
  "Somethings went wrong": "Somethings went wrong",
  "Cart": "Cart",
};
Map newMap = {};
data.forEach((key, value) {
  if (key.contains(' ')) {
    var newKey = key.toString().replaceAll(' ', '_').toLowerCase();
    newMap[newKey] = value;
  } else {
    var newKey = key.toString().toLowerCase();
    newMap[newKey] = value;
  }
});
print('newMap: ${newMap}');