Google Apps Script to allow editors to edit certain protected cells - google-apps-script

Question

I really need help for my code. What I do along with some other friends of mine is tutor as a part-time job. Every week, I create a sheet and have my friends fill out columns based on which group of people they tutored. Because sometimes some of my friends mistakenly fill out the wrong columns, I protect the columns and allow them to edit their respective columns by protecting every cell that they're not supposed to fill out. Because this is too tedious to do every week, I wanted to write a code instead so that when I run it it will see which editor is accessing the sheet and protect every other cell except the ones they're supposed to edit. Below is a similar code that I am working on that I can't make work. Cell, cell1 and cell2 represents three different groups of people that are tutored with each listing 1 email except cell2 which consist of two emails. These emails represent the editors (that tutor their respective group of people) who input data to their respective column. Range, range1 and range2 consists of cells that the tutors need to fill out. I have little to no knowledge for coding and this is what I can muster based on what I can find or learn. I really appreciate it if someone can help me edit my code as I don't know what to do.
function onOpen() {
var ss = SpreadsheetApp.getActive();
var source = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("test 3");
var email = Session.getActiveUser().getEmail();
var cell = source.getRange("A6").getValue();
var cell1 = source.getRange("C6").getValue();
var cell2 = source.getRange("E6:E7").getValue();
var range = ss.getRange('H5:H20');
var range1 = ss.getRange('J5:J20');
var range2 = ss.getRange('L5:L20');
if (cell == email) {
// Remove protection if cell 'A6' is email#gmail.com
var protections = ss.getProtections(SpreadsheetApp.ProtectionType.RANGE);
for (var i = 0; i < protections.length; i++) {
var protection = protections[i];
protection.remove();
}
}else {
// Protect range H5:H20 if cell 'A6' is not email#gmail.com
var protection = range.protect().setDescription('Sample protected range');
Logger.log
}
if (cell1 == email) {
// Remove protection if cell 'C6' is email1#gmail.com
var protections = ss.getProtections(SpreadsheetApp.ProtectionType.RANGE);
for (var i = 0; i < protections.length; i++) {
var protection = protections[i];
protection.remove();
}
}else {
// Protect range H5:H20 if cell 'C6' is not email1#gmail.com
var protection = range.protect().setDescription('Sample protected range');
Logger.log
}
if (cell2 == email) {
// Remove protection if cell 'C6' is email2#gmail.com
var protections = ss.getProtections(SpreadsheetApp.ProtectionType.RANGE);
for (var i = 0; i < protections.length; i++) {
var protection = protections[i];
protection.remove();
}
}else {
// Protect range H5:H20 if cell 'C6' is not email2#gmail.com
var protection = range.protect().setDescription('Sample protected range');
Logger.log
}
}